Principles of Electricity Applied to Telephone and Telegraph Work Sophie Penhaligon Bartali undertakes secret and dangerous

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Principles of Electricity Applied to Telephone and Telegraph Work Sophie Penhaligon Bartali undertakes secret and dangerousThis 1953 training course text, Principles of Electricity Applied to Telephone and Telegraph Work, was prepared by the Long Lines Department of the American Telephone and Telegraph Company (AT&T) as part of their internal employee education program. Designed for workers and technicians in the growing telecommunications industry, the manual explains the essential principles of electricity as they apply to telephone and telegraph systems, with clear