2 Utility Patents
#485 in Mito
#304,758 in Japan
Forward Citations = 28
Company Filing History:

Sumitomo Metal Industries, Inc.
Doryokuro Kakunenryo Kaihatsu Jigyodan
where one patent can have more than one assignee
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#485 in Mito
#304,758 in Japan
Company Filing History:

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