7 Utility Patents
#30 in Chiba-ken
#121,459 in Japan
#595,962 in the World
Forward Citations = 598
Company Filing History:

Hitachi Keiyo Engineering Co., Ltd.
Other
4. 2 out of 87
Hitachi Ulsi Engineering Corp.
5. 1 out of 162
Hitachi Engineering Co., Ltd.
where one patent can have more than one assignee
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