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Swimming pool
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Patent number 6,233,754
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Issue date May 22, 2001
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Rika Kogyo, Inc.
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Toshio Ajima
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E04 - BUILDING
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Swimming pool
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Patent number 6,151,726
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Issue date Nov 28, 2000
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Rika Kogyo, Inc.
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Toshio Ajima
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E04 - BUILDING
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3534413
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Patent number 3,534,413
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Issue date Oct 20, 1970
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A63 - SPORTS GAMES AMUSEMENTS
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1796291
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Patent number 1,796,291
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Issue date Mar 17, 1931
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A63 - SPORTS GAMES AMUSEMENTS
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1731551
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Patent number 1,731,551
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Issue date Oct 15, 1929
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C11 - ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES FATTY ACIDS...
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1630797
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Patent number 1,630,797
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Issue date May 31, 1927
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A63 - SPORTS GAMES AMUSEMENTS
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1536875
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Patent number 1,536,875
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Issue date May 5, 1925
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A63 - SPORTS GAMES AMUSEMENTS
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1331270
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Patent number 1,331,270
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Issue date Feb 17, 1920
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A63 - SPORTS GAMES AMUSEMENTS
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1285259
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Patent number 1,285,259
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Issue date Nov 19, 1918
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E04 - BUILDING
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722232
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Patent number 722,232
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Issue date Mar 10, 1903
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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520342
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Patent number 520,342
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Issue date May 22, 1894
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E04 - BUILDING