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公开(公告)号:US3132674A
公开(公告)日:1964-05-12
申请号:US16936762
申请日:1962-01-29
Applicant: NAT RES DEV
Inventor: NORMAN TURNER
IPC: B27H1/00 , B27M1/02
CPC classification number: B27M1/02 , B27H1/00