pdf Telephone Theory and Practice, Vol I Part I, Kempster B. Miller 1930 Popular
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Tel_Theory_Practice_Miller_v1_1930_Part_I_tci_ocr.pdf
95 pages. 5 MB Reference Book (extract). Vol I - Theory and Elements, Part I - Introductory. Contributed by Greg Goebel. Scanned by Paul Fassbender.
CONTENTS
I - MAN’S PROGRESS IN COMMUNICATION
II - PRECURSORS OF THE ELECTRIC SPEAKING TELEPHONE - MECHANICAL TRANSMISSION OF SOUND
III - EARLY HISTORY OF THE ELECTRIC SPEAKING TELEPHONE
IV - THE TELEPHONE SYSTEM
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