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975-115-100-se.pdf

975-115-100-se

Signals and Signaling Systems Between Offices - Used in
Message Telephone Service - General Descriptive Information, Issue 1,
1957-06-01, 37 pages (Note: SE didn't create this PDF. Probably came from
the CIC but?SE doesn't know for sure. SE has a paper copy and they seem to be
exactly the same.)

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