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公开(公告)号:US3143577A
公开(公告)日:1964-08-04
申请号:US2487960
申请日:1960-04-27
Applicant: NAT RES DEV
Inventor: DEREK BRYCE-SMITH , THOMSON BLUES ERNEST
公开(公告)号:US3143577A
公开(公告)日:1964-08-04
申请号:US2487960
申请日:1960-04-27
Applicant: NAT RES DEV
Inventor: DEREK BRYCE-SMITH , THOMSON BLUES ERNEST