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