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The practical telephone handbook and guide to the telephonic exchange (1906)

Poole, Joseph · New York, Macmillan Co. · leaf 416

An illustration from The practical telephone handbook and guide to the telephonic exchange, 1906, leaf 416 — Fig. 384.— ValentineConduits Wood-Block UNDERGROUND WORK 387 being embedded in concrete.* The brickwork is 9 inches wmjj^^^ … Fi~. 385.—Scale

Telephone

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