Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63F
CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
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A63F3/00173
Characteristics of game boards, alone or in relation to supporting structures or playing piece
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A63F3/00261
Details of game boards, e.g. rotatable, slidable or replaceable parts, modular game boards, vertical game boards
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A63F2003/00264
with rotatable or tiltable parts
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A63F2003/00287
about a horizontal axis
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A63F2003/0029
underneath the playing surface and viewable through holes or windows
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