Printing machine high voltage power system
Printing machine high voltage power system and circuit
Process for assembly of components on printed cards with the use
Protective alarm system
Protective alarm system for window using reflected microwave ene
Protective systems
Proximity sensor with simultaneously active intermixed sensor ty
Pushbutton purmutation code control means for a security alarm s
Radio and television alarm system
Radio central station alarm system
Rate-of-change combustion and contamination detection device
Real time signal discrimination circuitry
Redundant DC power supply for analog computers and the like
Refrigeration alarm
Refrigeration unit air temperature detection alarm system
Relaxation switch
Remote adding and reading device for a meter
Remote alarm monitoring and circuit control system
Remote alarm system for detection of fire extinguisher removal
Remote detector to indicate leakage of liquids in toilet tanks