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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13/00
Illuminated signs; Luminous advertising
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G09F13/34
with light sources co-operating with movable members, e.g. with shutters to cover or uncover the light source
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