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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G09F7/00 Signs, name or number plates, letters, numerals, or symbols; Panels or boards
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G09F7/18 Means for attaching signs, plates, panels, or boards to a supporting structure
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G09F7/20 for adjustably mounting
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