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Ibaraki Steel Center Co., Ltd.
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Ibaraki, JP
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Patents Grants
last 30 patents
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Patent Grant
Method of forming spring washer blind-holes into a piston for an au...
Patent number
7,823,432
Issue date
Nov 2, 2010
Ibaraki Steel Center Co., Ltd.
Masakazu Ooka
B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...