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公开(公告)号：US3518814A
公开(公告)日：1970-07-07
申请号：US3518814D
申请日：1967-03-28
Applicant: SMITH CORP A O
Inventor： MAYNARD JOHN T
CPC classification number: B25H1/20
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公开(公告)号：US3041976A
公开(公告)日：1962-07-03
申请号：US74627458
申请日：1958-07-02
Applicant: SMITH CORP A O
Inventor： MAYNARD JOHN T
IPC: H02K5/128
CPC classification number: H02K5/128 , F04D13/0606 , F04D29/5806 , H02K5/1285
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