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公开(公告)号：US3465570A
公开(公告)日：1969-09-09
申请号：US3465570D
申请日：1967-11-16
Applicant: NAT RES DEV
Inventor： MACLEAN ROBERT SISTERSON , SHARP ROYDS , MCCLINTOCK ANDREW LINDSAY MUIR
IPC: F15C1/00 , G01B13/02 , G01B13/08 , B23Q17/02
CPC classification number: G01B13/02 , F15C1/005
