Patent search ap:("APEX ELECTRICAL MFG CO") AND inv:"FRANTZ WALTER A" Page 3

21.

发明授权
Operating mechanism 失效

公开(公告)号：US1653266A

公开(公告)日：1927-12-20

申请号：US66433823

申请日：1923-09-24

Applicant: APEX ELECTRICAL MFG CO

Inventor： FRANTZ WALTER A

IPC: D06F37/36 , D06F37/38

CPC classification number: D06F37/38 , D06F37/36 , D06F2700/05

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