Shure - 1932 Shure becomes one of only four U. S. microphone manufacturers with the introduction of the Model 33N Two-Button Carbon Microphone. It is the first lightweight, high-performance product in a
March 4, 1877: The Microphone Sounds Much Better | WIRED
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Microphones
File:Carbon microphone, c. 1920s, Ellis Electrical Laboratories - Museum of Science and Industry (Chicago) - DSC06626.JPG - Wikimedia Commons
Carbon microphone - Wikipedia
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Ring Mount Carbon Microphones-Page 1
Microphones
Vintage 1930s Carbon Microphone W Radio Topper Rare!! | eBay
Electro-Voice Carbon Button Microphone (AKA “The Staff of Ra”) | Vintage Mike's