Telephone amplifier

Details Telephone amplifier Telephone amplifier

1984-07-10

1986-12-09

Burke, Wallace R.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D14 34, D14 60

Patent

active

D02871262

REFERENCES:
patent: D148151 (1947-12-01), Doblin
patent: D150861 (1948-07-01), Hruska et al.
patent: D192637 (1962-04-01), Judson
patent: D220629 (1971-05-01), Shimizu
patent: D227116 (1973-06-01), Sato
patent: D235088 (1975-05-01), Erickson
patent: D254249 (1980-02-01), Biehl
patent: D254565 (1980-03-01), Brown
patent: D259786 (1981-07-01), Leeson et al.
patent: 3747880 (1973-07-01), Bock
patent: 3991288 (1976-11-01), George et al.

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