Surface Machinery and Methods for Oil-Well Pumping Page: 68
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68 SURFACE MACHINERY AND METHODS FOR OIL-WELL PUMPING.
this kind of service it is very difficult to make timber braces rigid
even when well seated, bolted, and keyed.
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A modern type of push-and-pull power, using steel-rod pull lines
and having well-built and properly erected pull wheels, with the
same general arrangement as used in this old type, can be used
satisfactorily, especially f~or a property about three locations wide
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A mder tye o psh-nd-ullpoerusig see-ro pul lne
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George, H. C. Surface Machinery and Methods for Oil-Well Pumping, report, 1925; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc12407/m1/88/: accessed May 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.