BATTERY AND VIBRATOR CALL
PORTABLE TELEPHONE (British Army Type)
No. U 539
For Military Purposes, including Morse Signalling.
For Linesmanís Testing Set.
For Rifle Ranges.
For Use over Railway Telegraph Lines, etc., etc.
The whole mounted in stove enamelled Brass Case, and carried in solid Leather Containing Case, fitted with Shoulder Strap.
Taken from the Sterling Catalogue No. 11 & 12
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