Comprehensive assembly of apparatus for rotary hydraulic drilling; two or more hinged sections folding jack-knife fashion about a main basal section; also a new form of grip chuck, and positioning of the controls for the apparatus.
Patent by George Lanchester, John Hetherington, and Sterling Engineering Co. for improvements in mobile well drilling apparatus
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- ReferenceGB 434 LAN/6/264
- Dates of Creation16 October 1946