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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7/00
Signs, name or number plates, letters, numerals, or symbols; Panels or boards
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G09F7/02
Signs, plates, panels or boards using readily-detachable elements bearing or forming symbols
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G09F7/08
the elements being secured or adapted to be secured by means of grooves, rails, or slits
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G09F7/10
and slideably mounted
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