"Telephone" Article - Table of Contents IA. INTRODUCTION Part 1. Telephone - Introduction IB. HISTORY OF THE TELEPHONE Part 2. History of the Telephone II. TELEPHONIC INSTRUMENTS Part 3. Telephonic Instruments Part 4. Telephonic Circuits Part 5. The Working of Telephone Circuits The above article was written by Thomas Gray, B.Sc., F.R.S.E.; Glasgow.
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