Polling control system for switching units in a plural stage swi
Polling method and apparatus
Polling method and apparatus for a digital processing system
Polling system for multiple terminal units
Polling system for use in an audio system
Polling-type information transmission system
Polyfunction programmable data receiver
Porch or entry switch providing emergency signals
Port expander for utility meter reading
Portable battery operated power managed event recorder and inter
Portable communications receiver with separate information prese
Portable control code transmitter with delayed code neutralizati
Portable data transmitting/receiving apparatus
Portable electronic activation device
Portable electronic device and a method for processing data ther
Portable information device, access device for portable...
Portable information equipment system and control method...
Portable instrumentation telemetry device
Portable messaging and scheduling device with homebase station
Portable messaging and scheduling device with homebase station