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公开(公告)号：US2996649A
公开(公告)日：1961-08-15
申请号：US2275060
申请日：1960-04-18
Applicant: NAT RES DEV
Inventor： PATERSON LESLIE WILLIAM HENDER
IPC: H02P5/52
CPC classification number: H02P5/56
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公开(公告)号：US3230772A
公开(公告)日：1966-01-25
申请号：US8414761
申请日：1961-01-23
Applicant: NAT RES DEV
Inventor： PATERSON LESLIE WILLIAM HENDER , JOHNSTON HUNTER JOSEPH
IPC: G01K7/21
CPC classification number: G01K7/21
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