The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 365
ance. The S.A. Insulator. — Thisis a special form, invented byMessrs Sinclair & Aitken, andused where a line terminatesand a covered leading-in wireis to be attached to connectto an instrument, or otherwise.As seen in Figs 330 and 331,it is made in two parts, whichscrew together. The inner…
Telephone
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