7 Utility Patents
#256 in Musashino
#121,602 in Japan
#597,011 in the World
Forward Citations = 12
Company Filing History:
Japanese National Railways
Hakusan Seisakusho Co., Ltd.

4. 1 out of 1
Sumitomo Metal Technology Inc.
5. 1 out of 1
Sumikin Osaka Plant Engineering Co., Ltd.
where one patent can have more than one assignee
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