Electrical push-button Ultramatic transmission, 1956 Packard automobile

Artist's diagram of electrical push-button Ultramatic transmission system for the 1956 Packard car. Captions on front read: "Selector push buttons; Ultramatic, worm and segment gear; servo-motor; range selector shaft; from battery and ignition." Typed on back: "Packard models offer electrical push-button driving system. The electric push-button Ultramatic transmission for 1956 Packard models provides the ultimate to date in driving safety, comfort and convenience. Operation of the system is portrayed schematically. The driver's forefinger puts touch-pressure on the push-button 'D' for 'Drive.' With no mechanical linkage to overcome, touch-pressure of the forefinger sends electrical signal (course of signal shown by arrows) down from push-button console, located on stering [sic] column, through wire to 'servo-motor.' Upon receipt of electric signal, servo-motor turns in proper direction to actuate worm and segment gear which rotates range selector shaft which, in turn, chooses driving position indicated by driver's forefinger on push-button. The selection made, circuit of electrical power is broken off until need for another driving range selection. All this procedure takes place in smallest fraction of a second. The Packard electric push-button system is the only one to offer a 'safe-parking' feature."