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Gear crank for a bicycle
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Patent number 4,598,608
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Issue date Jul 8, 1986
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Shimano Industrial Company Limited
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Tadashi Ueno
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B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
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Sprocket for a bicycle
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Patent number 4,384,865
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Issue date May 24, 1983
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Shimano Industrial Company Limited
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Tadashi Ueno
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B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
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Multi-stage gear crank for a bicycle
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Patent number 4,259,880
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Issue date Apr 7, 1981
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Shimano Industrial Company, Limited
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Tadashi Ueno
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B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS