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Spring file
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Patent number 4,936,055
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Issue date Jun 26, 1990
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Nobuo Ishihara
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Polisher element
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Patent number 4,526,589
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Issue date Jul 2, 1985
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Nippon Tenshashi Kabushiki Kaisha
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Sachiko Ibata
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Method of manufacturing a polisher
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Patent number 4,456,500
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Issue date Jun 26, 1984
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Nippon Tenshashi Kabushiki Kaisha
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Sachiko Ibata
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Method for making file teeth
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Patent number 4,182,204
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Issue date Jan 8, 1980
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James A. Coon
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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File forming press
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Patent number 4,005,597
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Issue date Feb 1, 1977
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James A. Coon
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3913420
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Patent number 3,913,420
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Issue date Oct 21, 1975
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3719109
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Patent number 3,719,109
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Issue date Mar 6, 1973
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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2255268
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Patent number 2,255,268
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Issue date Sep 9, 1941
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR