UNBREAKABLE METAL CASED HAND COMBINATION
No. U 191
Unbreakable Aluminium Cased Hand Combination, for Mines, Railways, and all purposes where an exceptionally strong Instrument is required. Fitted with Special Receiver, Inset Granular Carbon Transmitter, Battery Key and Waterproof Flexible Cord. This Instrument is of simple construction, with no delicate or complicated parts to get out of order.
Note: We shall be pleased to quote on application for this Hand Combination adapted to suit special requirements, or arranged as a portable Instrument.
Taken from the Sterling Catalogue No. 11 & 12
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