MAGNETO RINGING TELEPHONES
(WITH DOUBLE-MAGNET GENERATORS)
No. U 340
Magneto Wall Telephone, same Instrument as No. U 335 , but mounted on Polished Walnut Backboard with Battery Box to accommodate one No. 2 Leclanche Cell or one Celevox Dry Cell.
Note: The above Instruments are suitable for distances up to about three miles.
Taken from the Sterling Catalogue No. 11 & 12
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