pdf 20apr Bell Telephone News - Chicago TelCo - Machine Switching Ocr R Popular
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20apr_Bell_Telephone_News_-_Chicago_TelCo_Machine_Switching_ocr_r.pdf
April 1920. Chicago Telephone Company. Feature article on Machine Switching in the Bell System. Contributed by Steve Cichorsky. OCR by Clint Gilliland.
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