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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A63C17/011
with steering mechanisms
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A63C17/013
with parallelograms, follow up wheels or direct steering action
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