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公开(公告)号：CA310512A
公开(公告)日：1931-04-21
申请号：CA310512D
Applicant: LIKENS LLOYD C , DAVIS THOMAS J
Inventor： LIKENS LLOYD C , DAVIS THOMAS J
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公开(公告)号：US1746084A
公开(公告)日：1930-02-04
申请号：US34313429
申请日：1929-02-27
Applicant: LIKENS LLOYD C , DAVIS THOMAS J
Inventor： LIKENS LLOYD C , DAVIS THOMAS J
IPC: E01B11/58
CPC classification number: E01B11/58
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