Switching exchange for telephone and/or data communication

Equipment for production – distribution – or transformation of ene – Energy conversion or transformation

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D02856808

REFERENCES:
patent: D197428 (1964-02-01), Massarella
patent: D208633 (1967-09-01), Pascale
patent: D279562 (1985-07-01), Wood
Telephony, vol. 202, Jan. 18, 1982, p. 92, Max-824 Phone System.

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