1925 First Electrical Recording - Stokowski - Philadelphia Orchestra
History of sound recording - Wikipedia
File:On The Air Novelty Microphone Radio, Model OTA-70, AM-FM Bands, Made In Taiwan, Circa 1980s (49630649827).jpg - Wikimedia Commons
Analog Recording. A Brief History of Sound Recording Before actual sound recordings existed, several mechanical formats were developed to reproduce. - ppt download
Shure 55SH Series II Dynamic Microphone with Mute Switch | eBay
A-Collection-of-Twelve-American-Modernist-Microphones-ca.-1925-1946-est.-25000-35000[1] | Sound Of The Hound
Microphones 1
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Lot-Art | A Western Electric carbon microphone, type 387, United States, ca. 1925. One of the most recognizable microphones of the early years of broadcasting.