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Rotary indexing shifter
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Patent number 6,012,351
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Issue date Jan 11, 2000
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Thunderbolt Enterprises, Inc.
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John A. Ysker
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Vehicle towing apparatus
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Patent number 5,984,342
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Issue date Nov 16, 1999
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Thunderbolt Enterprises, Inc.
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John A. Ysker
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B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
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Motorcycle frame
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Patent number D378996
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Issue date Apr 29, 1997
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Thunderbolt Enterprises, Inc.
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John A. Ysker
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D12 - Transportation