Carbon Grain Microphone by Mix and Genest. Publication of the book "Meyers Konversations-Lexikon", Volume 2, Leipzig, Germany, 1910

---

Size: 4500px × 4254px
Photo credit: © Kohl-Illustration / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: ancient, antique, black, book, button, carbon, communications, connection, design, encyclopedia, engineering, genest, german, germany, grain, historical, history, konversations, leipzig, lexikon, meyers, microphone, mix, print, publication, rarity, receiver, retro, technique, technology, telephone, transmitter, vintage, volume, white