Optical anti-theft system

Optical card-key data connector

Optical encoder

Optical encoder with integral flexible coupler

Optical port multiplexer for electric metering equipment

Optical selector switch and display apparatus

Optical sensor for utility meter

Optical service tool apparatus

Optical telemetric transceiver

Optically coupled gas meter

Optically readable and human readable dial

Optional apparatus connectable to other apparatus

Orally Mounted wireless transcriber device

Order entry system including an interactive menu display

Out of range indication for radio receivers

Outage notification system

Output circuit arrangement integrated in an integrated electric

Output method for dot data and apparatus therefor

Packet radio communication system protocol

Packet switching system