Patent search ap:("CALIFORNIA RESEARCH CORP") AND inv:"JOHNSON LAURENCE E" Page 1

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发明授权
Anchoring method and apparatus 失效
Title translation: 锚固方法和装置

公开(公告)号：US2988893A

公开(公告)日：1961-06-20

申请号：US74547558

申请日：1958-06-30

Applicant: CALIFORNIA RESEARCH CORP

Inventor： BORRMANN GERALD F , JOHNSON LAURENCE E , SCHURMAN GLENN A

IPC: B63B21/50 , E21B7/12

CPC classification number: B63B21/50 , E21B7/12

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