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https://oldtelephones.com/phones/sumter-transmitter-on-a-holtzer-cabot-rope-shaft-and-base/
Sumter transmitter on a Holtzer-Cabot rope shaft and base. - Old Telephones
Aug 28, 2023 - Holtzer-Cabot manufactured telephone parts for a lot of different telephone producers. One of Holtzer-Cabot’s very first uprights was a giant rope shaft. The...
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