Pulse producing system for secrecy transmissions
Pulse width modulation conversion circuit for controlling a colo
Pulse width responsive security system
Pulsed alarm system
Push button automatic transmission control device
Pushbutton call transmitter
Pushbutton data entry and display system
Pushbutton dial assembly
Pushbutton switch assembly for telecommunications and other inpu
Pushbutton switch assembly for telecommunications and other inpu
Pushbutton-controlled call-number selector for dial-equipped tel
PWM and variable frequency based position indicators