Patent classifications
G
PHYSICS
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G09
EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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G09G
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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3/00
Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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G09G3/008
forming an image on an image carrier by relative movement of a writing unit to the image carrier, e.g. on a photoconductive rotating belt, or on an electronic blackboard
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