Patent classifications
A
HUMAN NECESSITIES
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A63
SPORTS; GAMES; AMUSEMENTS
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A63J
DEVICES FOR THEATRES, CIRCUSES, OR THE LIKE; CONJURING APPLIANCES OR THE LIKE
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5/00
Auxiliaries for producing special effects on stages, or in circuses or arenas
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A63J2005/001
enhancing the performance by involving senses complementary to sight or hearing
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