4 Utility Patents
#1,331 in Hitachi
#193,377 in Japan
Forward Citations = 9
Company Filing History:

Hitachi Service Engineering, Ltd.
Nippon Telephone and Telegraph Corporation
4. 1 out of 6
Hitachi Service Engineering Co., Ltd.
5. 1 out of 1
Hitachi Engineerings and Services Co I, Ltd.
where one patent can have more than one assignee
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