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Pipe body and forming method of the same
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Patent number 7,318,455
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Issue date Jan 15, 2008
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Ricoh Company, Ltd.
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Takafumi Kondou
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Pipe body and forming method of the same
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Patent number 7,044,169
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Issue date May 16, 2006
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Ricoh Company, Ltd.
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Takafumi Kondou
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Pipe body and forming method of the same
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Patent number 6,745,448
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Issue date Jun 8, 2004
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Ricoh Company, Ltd.
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Takafumi Kondou
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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