7 Utility Patents
#2,164 in Saitama 343-0827
#121,772 in Japan
#598,868 in the World
Forward Citations = 33
Company Filing History:
Nippon Piston Ring Co., Ltd.

where one patent can have more than one assignee
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#2,164 in Saitama 343-0827
#121,772 in Japan
#598,868 in the World
Company Filing History:

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