Dolbear, A.E. The telephone : An account of the phenomena of electricity, magnetism, and sound, as involved in its action : With directions for making a speaking telephone / "by Prof. A. E. Dolbear, author of ""The art of projecting"", etc."; A.E. Dolbear .— : Charkes T. Dillingham, 1877 .— 130 с. — Lang: eng .— URL: https://rucont.ru/efd/105459 (дата обращения: 26.11.2025)