Improvements in and relating to apparatus for sinking and raising spuds or piles from pontoons used in drilling wells in oil fields located below lakes and other expanses of water
摘要
申请公布号
GB612201(A)
申请公布日期
1948.11.09
申请号
GB19460015023
申请日期
1946.05.17
申请人
MACTAGGART, SCOTT & COMPANY LIMITED;ROBERT GIBSON PRENTER