OPINION OF THE COURT
BARLOW, District Judge.
The plaintiff, Deborah A. Eshbaeh, a minor, by her parent and natural guardian, Marlin Eshbaeh, appeals from a jury verdict in favor of the defendant, W. T. Grant’s and Company.
In April of 1967, Marlin Eshbaeh, the father of the infant plaintiff, Deborah A. Eshbaeh, bought a riding, or sit-on type, 24-inch lawnmower from the defendant, W. T. Grant’s and Company. Mr. Eshbaeh used the mower without incident between the date of its purchase and September 5th, 1968. On that day, however, Mr. Eshbach’s son, Marlin, Jr., age 9, removed the mower from its storage spot, started it and proceeded to mow the lawn. Young Marlin had been instructed in the use of the mower and had previously operated it three times, in the presence of his father. The infant plaintiff, Deborah, had, on two prior occasions, jumped on the back of the mower behind her father while the mower was in use. She was warned by her father not to do so. On this occasion, however, while her brother operated the mower, out of his father’s presence and without his knowledge, Deborah jumped on the mower behind her brother. While the mower was circling a tree, Deborah’s foot slipped into the unguarded chain and sprocket of the machine and became entangled. Marlin, Jr., hearing the cries of his sister, stopped the machine by taking his foot off the pedal. The machine had neither brakes nor an ignition switch.
As a result of the accident, Deborah suffered severe injuries to her left foot.
Plaintiff thereafter commenced a diversity action pursuant to 28 U.S.C. § 1332, solely upon the theory of strict liability, § 402A, Restatement of Torts (Second), alleging that the unguarded chain and sprocket, along with the absence of an ignition switch and key device, represented a defective design condition which caused the infant plaintiff’s injuries.
The case was tried before a jury, the plaintiff’s case included expert testimony as to the defective design of the machine. The defense offered no testimony.
Following the judge’s instructions and after deliberation, the jury returned a verdict for the defendant, and it is from the judgment entered thereon that the plaintiff appeals.
I.
Plaintiff-appellant’s initial contention is that the frequent use of the concept of foreseeability in the charge of the court, as well as those instructions of the court defining the limits of the responsibility of the seller in terms of a “reasonable man” or an “ordinarily in