Patent search ap:("NAT RES DEV") AND inv:"JOHN FARVIS WILLIAM EWART" Page 1

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发明授权
Electrical circuit breakers 失效
Title translation: 电气断路器

公开(公告)号：US3206642A

公开(公告)日：1965-09-14

申请号：US21045762

申请日：1962-07-17

Applicant: NAT RES DEV

Inventor： JOHN FARVIS WILLIAM EWART

IPC: H01H5/04 , H01H9/56 , H03M1/00

CPC classification number: H01H5/04 , H01H9/56 , H03M1/00 , H03M1/08

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