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n4google.
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Subject Item
isa:161624360
rdf:type
prov:Entity
prov:value
A turbodrill, comprising a body including a case adapted to be suspended from the lower end of the string and a shaft arranged within the case to define an annular space therebetween and adapted to suspend a bit from its lower end, a bearing section having axial thrust bearings which support the shaft for rotation with respect to the case, an extension on the case fitting within the upper end of t
prov:wasQuotedFrom
n4:com
Subject Item
isap:167690753
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isa:161624360