It was not until 1924, however, that any real progress was made toward 

 creation of our modern-day drilling turbine. In that year, C. C. Scharpenberg, 

 of the Standard Oil Company of California, secured patents for a multiple-stage 

 turbine remarkably similar in design to those used today. In 1926, the protoype 

 of the Scharpenberg drill was used for experimental work in California. The 



Figure 31-1. Turbodrill being tested at Dallas, Texas. 



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