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No. 4128
Portable telephone
for
buzzer call consisting of lacquered teakwood box with carrying strap, hand
combination with change over key in handle and four conductor cord, induction coil, buzzer, calling key, 2
condensers, 2 dry cells type T4 and terminals.
Net weight about 4.5 kgs.
Taken from the Siemens & Halske Telephone Catalogue
1912
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