7 Utility Patents
#1,291 in Ibaraki
#119,836 in Japan
#582,799 in the World
Forward Citations = 72
Company Filing History:
Hitachi Engineering Co., Ltd.

where one patent can have more than one assignee
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#1,291 in Ibaraki
#119,836 in Japan
#582,799 in the World
Company Filing History:

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