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Number 5 Crossbar System (1954) -
971.501.01-Issue-1-Feb.-1954.pdf
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Telephone World
23-08-2020 1:58
4A Toll Crossbar -
4A Toll Crossbar.pdf
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Telephone World
21-08-2020 12:24
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Number 5 Crossbar System (1954) - 971.501.01-Issue-1-Feb.-1954.pdf