An international page:

This is how business key systems looked like in Italy. Designed ~1958 in Milan:

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This is a secretary-director set for use with one external line and one intercom line. There was an extended version with 2 outside lines and 6 or 4 internal extension stations (with numbered signaling keys in the front).

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A pair of Italian “videophones” from 1970s. These were actually door video intercoms:

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Last edited by RedBul; 10/24/19 03:53 AM.