Telephone busy lamp field console

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

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Details

D14 53, D1403

Patent

active

D02696754

REFERENCES:
patent: D232563 (1974-08-01), Marchese
patent: D236501 (1975-08-01), Conway et al.
patent: D251843 (1979-05-01), Knoll et al.
patent: D254436 (1980-03-01), Bakal
Telephony, vol. 196, Mar. 12, 1979, p. 49, Digital Telephone System.

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