pdf ATT 5XB vI Mar55 Wire Spring Sec5- Intraoffice Call Popular
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ATT_No_5_Crossbar_Switching_System_vI_Sec5_Mar55_Wire_Spring_Relay_Circuit_Intraoffice_Call_tci_ocr.pdf
From: No. 5 Crossbar Switching System - Wire Spring Relay Circuit
Volume 1 - Wire Spring No. 5 Crossbar System
Section 5- Intraoffice Call
Scanned and Contributed by Steve Cichorsky
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