Intercom master control unit

Recording – communication – or information retrieval equipment – Computer – data processor equipment

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D02897580

REFERENCES:
patent: D244877 (1977-06-01), McLaughlin
patent: D269780 (1983-07-01), Doodson
patent: D274518 (1984-07-01), Doodson
patent: D278054 (1985-03-01), Vajdaffy
patent: D281500 (1985-11-01), Yamagata et al.
patent: D281501 (1985-11-01), Yamagata et al.
patent: 4019139 (1977-04-01), Ortega
Radio Shack 1983 Catalog, p. 107, bottom of page.

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