pdf Bell System Anti-Sidetone Equipment, 1952 Popular
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Bell_System_Anti-Sidetone_Equipment_Lesson_XIII_1952_tci_ocr.pdf
Lesson XIII, Elementary Correspondence Course, Bell Tel. Co. of PA, Diamond State Tel. Co. 1952 view highlights 300- and 500-type phone circuits. Features of the "new" 500-type sets. Contributed by Paul Fassbender.
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