16 Utility Patents
#52 in Katsuta
#49,014 in Japan
#227,485 in the World
Forward Citations = 174
Company Filing History:

Hitachi Engineering Co., Ltd.
Hitachi Elevator Engineering & Service Co., Ltd.
4. 1 out of 2
Hitachi Building Systems Engineering and Service Co., Ltd.
where one patent can have more than one assignee
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