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Changeable display mechanisms
US 2,754,605 A
Filed
: 12/24/1949
Issued
: 07/17/1956
Est. Priority Date
: 12/24/1949
Status: Expired due to Term
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Current Assignee
Arnold D. Berkeley
Original Assignee
Arnold D. Berkeley
Inventors
Berkeley, Arnold D.
Application Number
US03/134,893
Time in Patent Office
2,397 Days
Field of Search
US Class Current
40/471
CPC Class Codes
G09F 11/29
of a band other than endless
G09F 13/34
with light sources co-opera...
G09F 2011/0054
using a support in the form...
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