Telephone ear piece aid

Details Telephone ear piece aid Telephone ear piece aid

1983-08-24

1986-07-15

Burke, Wallace R.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D14 59, D14 67

Patent

active

D02846616

REFERENCES:
patent: D142133 (1945-08-01), Woodruff
patent: D164491 (1951-09-01), Hansen, Jr. et al.
patent: D171161 (1953-12-01), Lanabell
patent: D183019 (1958-06-01), Porter
patent: D187793 (1960-05-01), Scanlon
patent: D214128 (1969-05-01), Eriksson
patent: 1581700 (1926-04-01), Summer
patent: 2468721 (1949-04-01), Volkmann
patent: 2474135 (1949-06-01), White
patent: 3072755 (1963-01-01), Kuhberg
patent: 4185175 (1980-01-01), Kondo et al.

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