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Telephones, their construction and fitting; a practical treatise on the fitting-up and maintenance of telephones and the auxiliary apparatus (1892)

Allsop, Frederick Charles · London, New York, E. & F.N. Spon · leaf 222

An illustration from Telephones, their construction and fitting; a practical treatise on the fitting-up and maintenance of telephones and the auxiliary apparatus, 1892, leaf 222 — ■|@:® Co t^ fl^ ® c® 0 0 3® ®1^ ^ OIPfEHef^T POSITIONS OF SWITCH U/ME N?Z L/A/S A«/ (iNTERMEOIflTE) … C/A/e A/£3 I

Telephone

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