System for interconnecting parking meters having a memory

System for load output level control

System for locating display devices

System for maintaining receiver/transmitter synchronization with

System for making a thermo-active device temperature dependent

System for measuring a parameter within a closed environment

System for measuring domestic consumption of electricity,...

System for measuring electrical resistance and temperature durin

System for monitoring an industrial installation

System for monitoring and controlling electrical consumption, in

System for monitoring status of plurality of repeaters

System for monitoring switch locations

System for monitoring the use of heat energy in water devices in

System for monitoring water consuming structures in an...

System for off-the-air reprogramming of communication receivers

System for operating a display panel

System for producing printed products

System for providing paging receivers with accurate time of day

System for providing several data terminals with access to a dig

System for providing wireless pointer control