Swash plate pump
Swash plate type compressor
Synchronized variable displacement rotating hydraulic...
System and method for controlling a progressing cavity well...
System and method for variable speed operation of a screw...
System and method of lubricating air compressors and the like
System and method to reduce acoustic noise in screw compressors
System and methods for controlling rotary screw compressors
Systems and methods to retard rod string backspin