Megaphone

Details Megaphone Megaphone

1981-07-01

1983-12-27

Corrigan, Jane E.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D1401

Patent

active

D02719681

REFERENCES:
patent: D46404 (1914-09-01), Lougee
patent: D168578 (1953-01-01), Levison
patent: D173727 (1954-12-01), Hardesty

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