Wide, flat bed trailer, mounted on pair of crawler treads, solves problem of location switch of derrick for relatively shallow drilling; stripped only of crown block and drawworks, derrick is lifted and centered by trailer, and towed to new site by same tractor which spots hauling unit below specially constructed derrick floor section.
Special trailer speeds Derrick moves
World Oil
World Oil ; 127 , n 6
1947
3 pages
Article (Journal)
English
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