UNBREAKABLE HAND SET FOR MINES
No. U 571
Portable Hand-Combination, comprising Special Inset Transmitter and Receiver, fitted in Unbreakable Aluminium Case with Switch Key and Waterproof flexible Cord (Two-way or Four-way as required).
This Instrument is very suitable for cases where a portable Telephone is required for use on the existing signal wires
The Telephone at the Engine House should be No. U 565A with a 1,000 ohm Relay. If ordering the latter for this System please state for use with No. U 571 on signalling wires.
NOTE: We shall be pleased to quote for this Hand Combination adapted to suit special requirements.
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