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公开(公告)号：US2638823A
公开(公告)日：1953-05-19
申请号：US6903249
申请日：1949-01-03
Applicant: STANDARD OIL DEV CO
Inventor： CARL ROEDIGER JOSEPH
IPC: E01C7/18
CPC classification number: E01C7/18
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公开(公告)号：US2616837A
公开(公告)日：1952-11-04
申请号：US6903149
申请日：1949-01-03
Applicant: STANDARD OIL DEV CO
Inventor： CARL ROEDIGER JOSEPH
IPC: C10C3/04
CPC classification number: C10C3/04
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