 DENVER--BUSINESS WIRE--Liberty Oilfield Services Inc. NYSE: LBRT; Liberty announced today the successful completion of the rigorous field testing of Libertys digiFracTM electric pump. Developed by Libertys ST9 commercial equipment division, digiFrac is the industrys first purpose-built fully integrated electric frac pump with high power density and significantly lower emissions relative to the best next generation frac technology available in the market. Final field testing for digiFrac 