5 Utility Patents
#661 in Tochigi
#162,714 in Japan
#829,069 in the World
Forward Citations = 9
Company Filing History:
Nippon Piston Ring Co., Ltd.

Sanyo Special Steel Co., Ltd.
4. 1 out of 89

5. 1 out of 21,853

where one patent can have more than one assignee
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