Protective systems
Proximity sensor with simultaneously active intermixed sensor ty
Pseudo multi light display device and generator therefor
Pseudolite positioning system and method
Pull station
Pull station
Pull station protector
Pulse coded warning system for racetrack
Pulsed-tone timing exercise method
Pushbutton purmutation code control means for a security alarm s
Race recording and display system
Racing control system
Racing control system
Racing vehicle position indication system and method
Radio and television alarm system
Radio central station alarm system
Radio communication system
Radio frequency detection circuitry having noise discrimination
Radio frequency identification (RFID) pin detection system
Radio pager having optional annunciating means