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| U 552 | U 553 |
PORTABLE FIELD TELEPHONE EXCHANGE OR COMMUTATOR
FOR BATTERY AND VIBRATOR CALL
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| U 552 | U 553 |
No. U 552 - For Single Lines
No. U 553 - For Double Lines
Portable Field Telephone Exchange or Commutator, enabling the Operator to receive or transmit either Telephone Messages or Morse Signals, and to establish through connections between side stations when required. A powerful phonic Buzzer or Receiver provided for incoming calls, and a code must be arranged to indicate which side station is calling. Each Bar has a sufficient number of through bars to enable the whole of the stations to be connected in pairs. The Operator can tap any through connection.
Fitted with Safety Line Terminals. Woodwork Solid Polished Mahogany. Provided with
Waterproof Canvas Containing Case and Shoulder Strap.
Available in 4, 6, 8, 10 or 12 ways.
Taken from the Sterling Catalogue No. 11 & 12
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