Curso telefonia básica / Cláudio Romano
Chronique illustrée du concours international de télégraphie pratique : Turim 1911
Telephones: their construction, installation, wiring, operation, and maintenance : A practical reference book and guide for electricians, wiremen, engineers, contractors, architects, and others interested in standard telephone practice / W. H. Radcliffe, H. C. Cushing
Principles of radio communication / John H. Morecroft, A. Pinto, W. A. Curry
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