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Handy air tool
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Patent number 5,235,784
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Issue date Aug 17, 1993
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Nitto Kohki Co., Ltd.
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Yasumasa Oki
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Annular hole cutter
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Patent number 5,217,334
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Issue date Jun 8, 1993
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Nitto Kohki Co., Ltd.
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Osahiko Miyazaki
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Safety device for a pneumatic tool
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Patent number 5,069,421
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Issue date Dec 3, 1991
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Nitto Kohki Co., Ltd.
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Katsunobu Kishi
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS