1
Zadig Ernest A: Electronic musical instrument employing plural tuning sheets and a hand-held selector. July 13, 1971: US3592098 (22 worldwide citation)

A device for producing selected tones includes an electrically operated tone generator which includes a stylus and a plurality of terminals for producing tones by completing a circuit through the stylus and the one of the terminals that will cause the desired tone to be produced. A separate conducto ...


2
Zadig Ernest A: Testing apparatus for selectively enabling controlled equipment. May 22, 1973: US3735381 (7 worldwide citation)

Electronic apparatus requires that the operator of a motor vehicle accurately trace the full course of a segmented undulating serpentine path as a condition precedent to starting a motor vehicle. The path segments must be engaged in seriatum to enable the automobile ignition circuit via intermediate ...