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Screenshot of calling315.com: The evolution of annunciator signaling for telephones

The evolution of annunciator signaling for telephones (calling315.com)

86 points by Kovalick 1 year ago | 13 comments

Screenshot of calling315.com: The Pentaconta Crossbar and Exchange

The Pentaconta Crossbar and Exchange (calling315.com)

44 points by gjvc 2 years ago | 9 comments