Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63C
SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
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17/00
Roller skates; Skate-boards
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A63C17/04
with wheels arranged otherwise than in two pairs
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A63C17/08
single-wheel type; with single axis
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