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
Remote electric state tester
Remote personnel station alarm system
Restaurant service management system
Restaurant service management system
Restaurant table turn system network
Restaurant waiter paging system
Retail service/server annunciator/pager, centerpiece and system
Retail service/server annunciator/pager, centerpiece and system