With the hindsight so characteristic of many appellants, the plaintiff below now vigorously attacks the instructions of the District Court — instructions to which his counsel formally announced there was no objection, in a statement made in open court immediately after they were given.

The appellant also assails the admission of certain testimony relating to the appellee’s officers’ lack of notice of any previous comparable accident involving any of its fork lift trucks while operated without the boom. It is assumed by the appellant that there is a conflict of laws between California, the locus in quo, and Oregon, the locus fori. As we shall see, this conflict is largely illusory.

1. Statement of the Case

The appellant brought an action for $205,000 as general damages for the ap-pellee’s alleged negligence in the manufacture and assembling of a fork lift truck, which it is asserted tipped over and injured the appellant while he was driving it. The jury returned a verdict for the appellee, and the present appeal is from a judgment based upon that verdict.

2. Statement of Facts

According to Arthur M. James, an expert witness for the appellant, a fork lift truck is used to transport lumber or other commodity. The machine in question consisted of “a front axle with four tires and a rear axle with two tires, an engine and gears to provide power and steering, and a counterbalance or counterweight to overcome the * * * tipping effect of the weight in the front.”

According to the agreed statement of facts, the appellee manufactures and sells fork lift trucks in Dallas, Oregon. In September, 1952, it sold a 130-inch wheel base Gerlinger Fork Lift Truck, delivered at Dallas, to Herbert E. Phil-brook, of Philo, California. On that date, Philbrook arrived at Dallas with a tractor-trailer to take delivery of the truck. He drove the tractor-trailer with its load from Dallas to Philo to the L. E. Whitaker Mill, arriving on September 9, 1952.

That afternoon a Ross fork lift was used to unload the boom and the lift truck was driven off the trailer by the appellant. While the Gerlinger fork lift truck was being operated by the appellant, he received the injuries that form the basis of this suit.

Although the agreed statement of facts gives no particulars, the details of the accident can be pieced together from the transcript of record. According to the appellant’s testimony, “The truck came in with this heavy truck on it * * *. We used another lift truck to take that boom off the load out onto the ground. * * *

“I was * * * up on the truck * * *. Then I drove it (the motor section of the fork lift) directly off the truck onto this dock * * *. I had backed that down in low reverse, backed down about three lengths of the machine, when it flipped bottomside up.” The appellant testified that he was driving about two miles an hour. He said that he drove the machine “right off the truck onto this dock”. “I lined it up and came straight down”.

As the appellant came down the “hill” or “ramp or incline”, as it has been variously called, he was looking over his left shoulder, watching the direction in which he was going, with his right hand around the steering wheel. He then made a 20 degree turn, up toward a lumber yard.

“As I turned the wheel,” the appellant continued, “I turned around and the next thing I remember I was laying underneath it.”

It will be seen that the front boom assembly was detached, so that when it was unloaded the motor section would be driven off under its own power and the fork lift assembly would be unloaded separately with a crane or other machine.

James, the appellant’s expert who is a licensed consulting engineer, testified that the fork lift truck would be safe to operate backward and down the slope in question with the fork lift, but “very dangerous” with the boom assembly detached.

On the other hand, Harry A. Herzog, a sawmill owner, who has three Ger-linger lift trucks of the 130-inch wheelbase type that figures in the present litigation, and who was called as a witness for the appellee, said:

3. Principal Questions Presented

During the oral argument, counsel for the appellant announced that he was presenting only two points; namely, (1) Testimony that a witness has never heard of a prior accident is inadmissible; and (2) The instructions of the District Court were so erroneous, confusing, and misleading that this Court should review them on its own motion.

A number of other points are urged in the appellant’s brief. Despite the fact that they were not argued orally, we are not assuming that they have been abandoned, but will refer to them hereinafter.

4. The Admissibility of Testimony That the Witness Had Never Heard of a Prior Accident Is Clear Under Both California and Oregon Law

Counsel for the appellee inquired of Victor O. Williams, executive vice president and general manager of the ap-pellee, who had been called as a witness by the appellant, whether in the years that the appellee had been manufacturing fork lift trucks there had “ever been a complaint, either in court or to the (appellee), as to the stability of this fork lift truck (with the boom assembly detached) when being loaded or unloaded or any other time?”

After the witness had replied in the negative, counsel for the appellant objected on the ground of irrelevancy, and his objection was overruled. The admission of this testimony is specified as error. The appellant also now objects to the fact that Williams was permitted to testify that “he had never heard of a Gerlinger fork lift truck tipping over while being unloaded and loaded where the general practice was to ship them with the boom assembly detached.” This latter bit of testimony was not objected to at the time it was given, and, contrary to the language used in the specification, the question about the “tipping over” did not include the element of whether Williams had “heard” of it. The record shows the question and answer were as follows:

The appellant objects to the admission of similar testimony by Ray W. Gohrke, assistant manager of the appellee, and the observations that follow apply to his evidence as well.

Although the appellant has stoutly maintained in his brief and in his oral argument that “where substantial (substantive?) rights are directly controlled by what procedural rule would otherwise be followed, the law of California applies as the place of injury”, he quotes at some length from a United States Supreme Court decision in which the question of a conflict of laws was in no way involved. In First National Bank of Xenia, Ohio v. Stewart, 1885, 114 U.S. 224, 232 , 5 S.Ct. 845, 849 , 29 L.Ed. 101 , a bank teller was asked the following question:

The offer of proof showed that a negative reply was expected. The Supreme Court said:

The Stewart case is in no way in point. There the issue was whether the bank had received from McMillan certain money with which to pay his note held by a third party, or whether it had paid the note out of its own funds. The fact of payment by McMillan was sought to be disproved by means of the testimony of the teller: the question of notice was not involved. Here, on the other hand, the matter of notice was distinctly in issue. In the pre-trial order, two of the contentions of the appellant are set forth as follows:

The appellant also cites Murphy v. County of Lake, 1951, 106 Cal.App.2d 61, 65 , 234 P.2d 712, 715 , where it was held “that evidence of the absence of previous accidents to show that no dangerous condition existed is inadmissible.” Here again the appellant misconceives the purpose of the testimony in question; namely, to show that responsible officers of the appellee had no notice of any prior accidents.

Finally, the appellant relies upon Gid-dings v. Superior Oil Co., 1951, 106 Cal.App.2d 607, 612 , 235 P.2d 843, 845 . There the question of notice was involved, but the case can be distinguished on the facts from the present suit:

The Giddings case can easily be distinguished on the ground that there the effort was to introduce evidence that there had been a previous accident, but to a child of far less maturity than the one who figured in the case then before the court. Here, on the other hand, we are considering the admissibility of testimony that the officers of the company had heard of no accidents in which a Gerlinger fork lift truck without a boom had tipped. The testimony was negative, and related to notice of any accident to a “boomless” lift truck anywhere and at any time.

Up to this point we have assumed, for the sake of the argument, that this problem of evidence should be solved according to the law of the State of California, where the alleged tort occurred. This assumption, however, is not founded in law. In Rule 43(a) of the Federal Rules of Civil Procedure, 28 U.S.C.A., we find the following statement:

In the instant case, the State of the forum is Oregon. In the courts of that commonwealth, evidence of the type we are now discussing would clearly be admissible.

In Robertson v. Coca Cola Bottling Co., 1952, 195 Or. 668 , 247 P.2d 217, 223 , Chief Justice Brand said:

The appellant suggests, as we have already noted in passing, that “where substantial (he probably means “substantive”, as contradistinguished from “adjective” or “procedural”) rights” are involved, “the law of California applies as the place of injury”. We do not agree. The admissibility of testimony relating to prior notice of a dangerous instrumentality is simply a problem in evidence, and is therefore a matter of adjective law, governed by the lex fori. This is a hornbook principle, and need not be labored here.

In any event, it is clear that, under the jurisprudence of California as well as that of Oregon, in a case of this kind evidence of the type in question is admissible, if it is introduced for the purpose of showing notice of a disputed fact and not to prove the fact itself. It is unquestionably admissible in cases where, as here, a negative is to be established; for in such a situation, no accident at all having been reported, a similarity of circumstances is not merely unnecessary but impossible. If responsible officers of a company have heard of no accidents to a boomless fork lift truck, the questions of details becomes moot, at least so far as notice is concerned.

It follows from the foregoing that the jury could well conclude that the ap-pellee’s officers were not negligent in not warning their customers against operating the fork lift trucks without the booms, when they themselves had not heard of any accidents that had occurred as a result of such boomless operation. They could not be chargeable with negligence for failing to warn of a danger that they had no reason to believe existed.

Indeed, evidence adduced by the appellant himself indicates that it was precisely this belief on the part of the ap-pellee’s officers in the safety of the boom-less operation that accounted for their not warning their customers against it. Vice President Williams testified:

Similarly, Gordon Akers, the appel-lee’s assembly foreman, likewise called by the appellant, said on direct examination :

5. The Appellant Is in No Position, to Attack the Instructions

When the District Judge had! given his instructions, he announced to-counsel that under the Rules of CiviL Procedure, they were at that time entitled to state their objections to his. charge. Mr. Dilley, who throughout the- trial had shown skill, zeal, and alertness on behalf of the appellant, made the following formal statement:

Rule 51 of the Federal Rules of Civil Procedure reads in part as follows:

Rule 18 subd. 2(d) of this Court provides in part:

Not having complied with Rule 51, the appellant obviously was unable to comply with the final phrase contained in the sentence in Rule 18, subd. 2(d) quoted above.

Because of this flagrant disregard of the Federal Rules of Civil Procedure and of the Rules of this Court, the appellant now has no standing to object to the charge of the District Judge.

In Woodworkers Tool Works v. Byrne, 9 Cir., 1951, 191 F.2d 667, 676 , this Court said:

Even in criminal cases, where the courts are ever on the alert to guard the rights of defendants, a similar rule has been promulgated and has been enforced.

6. The Other Specified Errors Contain No Merit.

The appellant also asserts that the appellee’s objections to interrogatories were filed three days too late, and that the objections were “invalid”, anyway; and that opinion testimony based upon experience of the witness with other types of machinery, etc., is inadmissible. Here again we find that the criticism is captious, and that the matters complained of constitute no grounds for reversal.

7. Conclusion

The Court below did not err in admitting testimony to the effect that responsible officers of the appellee company had never heard of any accident involving a boomless fork lift truck.

Because of failure seasonably to object to the instructions of the District Judge, the appellant is now precluded from attacking them.

The other specified errors, enumerated above, do not constitute grounds for reversal.

Accordingly, the judgment is affirmed.

. In the appellant’s brief, there is omitted from this excerpt from Stewart the op-positive word “but”. The omission — no doubt inadvertent — of this quasi-negative completely alters the meaning of the sentence and renders it pointless. ' . For a recent discussion of the problem of a conflict of laws in a Federal case where, as here, jurisdiction is based upon diversity of citizenship, see the opinion of James M. Carter, D. J., in Anderson v. Hearst Publishing Co., D.C.Cal.1954, 120 F.Supp. 850, 853-857 ; and an extended comment on Judge Carter’s opinion in Stanford Law Review, March, 1955, Volume 7, No. 2, pages 275-285, entitled “Public Policy and the Conflict of Laws”.. . Rule 30, Rules of Criminal Procedure, 18 U.S.C.A.; Kobey v. United States, 9 Cir., 1953, 208 F.2d 583, 597-598 ; Benatar v United States, 9 Cir., 1954, 209 F.2d 734, 743-744 , certiorari denied 1954, 347 U.S. 974 , 74 S.Ct. 786 , 98 L.Ed. 1114 .