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Pistons
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Patent number 5,913,960
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Issue date Jun 22, 1999
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Wellworthy Limited
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David Francis Fletcher-Jones
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Method of making a piston
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Patent number 4,997,024
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Issue date Mar 5, 1991
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T&N Technology Limited
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Andrew T. Cole
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B22 - CASTING POWDER METALLURGY
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Pistons for internal combustion engines
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Patent number 4,989,559
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Issue date Feb 5, 1991
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Wellworthy Limited
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David F. Fletcher-Jones
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Pistons
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Patent number 4,228,727
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Issue date Oct 21, 1980
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Wellworthy Limited
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David C. Speaight
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Pistons
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Patent number 4,114,519
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Issue date Sep 19, 1978
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Wellworthy Limited
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David Clement Speaight
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Sealing ring assemblies for pistons
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Patent number 4,111,438
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Issue date Sep 5, 1978
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Wellworthy Limited
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Gerald Longfoot
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR