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2.Method and device for embedding a line, a cable or the like underground 失效
Title translation: 用于在地下嵌入线,电缆等的方法和装置公开(公告)号:US3287922A
公开(公告)日:1966-11-29
申请号:US17621762
申请日:1962-02-28
Applicant: RUDOLF HARMSTORF
Inventor: RUDOLF HARMSTORF
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3.Method and device for installation of steel pipe below the bottom of a body of water 失效
Title translation: 用于在水体底部安装钢管的方法和装置公开(公告)号:US3389564A
公开(公告)日:1968-06-25
申请号:US50896865
申请日:1965-11-22
Applicant: RUDOLF HARMSTORF
Inventor: RUDOLF HARMSTORF
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