Patent classifications
G
PHYSICS
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G09
EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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G09F
DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
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9/00
Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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G09F9/30
in which the desired character or characters are formed by combining individual elements
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G09F9/375
the position of the elements being controlled by the application of a magnetic field
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