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ACOS MIC22 Vintage Microphone | #245241489
Miniature Radio In Snuff Tin With Acos Microphone Ear Bud – Mullard Antiques and Collectibles
Vintage ACOS Microphone British Dynamic Crystal Reel To Reel Tape Recorder. | eBay
European microphones
VINTAGE ACOS HIGH FIDELITY MICROPHONE | #424443575