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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A63H33/04
Building blocks, strips, or similar building parts
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A63H33/06
to be assembled without the use of additional elements
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A63H33/08
provided with complementary holes, grooves, or protuberances, e.g. dovetails
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A63H33/086
with primary projections fitting by friction in complementary spaces between secondary projections, e.g. sidewalls
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