Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Patent
1990-03-19
1992-09-15
Rademaker, Charles A.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Element or attachment
Patent
active
D03294323
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patent: 4672976 (1987-06-01), Kroll
patent: 4893344 (1990-01-01), Tragardh et al.
David Clark Series 3100 Catalog, p. 4, Model 3161 & 3162 Units.
Dewees Paul J.
Dewees Richard W.
Lanford Milton N.
Missouri Auction School, Inc.
Rademaker Charles A.
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