Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63H
TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
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18/00
Highways or trackways for toys; Propulsion by special interaction between vehicle and track
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A63H18/02
Construction or arrangement of the trackway
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A63H18/023
Track control means, e.g. switches
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