รหัส 3 อุปกรณ์ต่อพ่วงโทรศัพท์ และอินเตอร์คอม

TELEPHONE RECORDING ADAPTER

MUSIC ON-HOLD TELEPHONE

TELEPHONE EXTENSION RINGER

BUSY TELEPHONE INDICATOR

DUAL STATION INTERCOM

TWO-WAY TELEPHONE AMPLIFIER

MINI TELEPHONE CIRCUIT

HIGH POWERED TELEPHONE RINGING 10W

TELEPHONE IN-USE INDICATOR

TWO-WAY TELEPHONE AMPLIFIER

TELEPHONE INTERCEPTION

TELEPHONE EXPERIMENTAL BOARD

PHONE RING SIGNAL LIGHT 500W

RINGING SIGNAL LIGHT 5 LED

DUAL STATION INTERCOM

TELEPHONE PRIVACY PROTECTION

TELEPHONE TRANSMITTER (FM 88-108 MHz)

TELEPHONE PROTECTION