27 Utility and 1 Design Patents
#49 in Mito
#23,334 in Japan
#108,644 in the World
rank by utility patentsForward Citations = 354
Company Filing History:

Japan Servo Co.,ltd.
Hitachi Industrial Equipment Systems Co., Ltd.
4. 4 out of 149
Hitachi Powdered Metals Co., Ltd.
5. 2 out of 832,575 patents
Other
where one patent can have more than one assignee
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