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2988824
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Patent Grant
2988824
References
Source
Patent Number
2,988,824
Date Filed
Not available
Date Issued
Tuesday, June 20, 1961
62 years ago
CPC
G01J3/528 - using colour harmony theory
G01J3/522 - circular colour charts
G09B1/22 - and bearing the symbols on a surface perpendicular to the axis of rotation
G09B19/0023 - Colour matching, recognition, analysis, mixture or the like
US Classifications
434 - Education and demonstration
273 - Amusement devices: games
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