... designer, manufacturer and repairman of hydraulic pumps ,motors and test instrument and hdyraulic test bench.1. got the country patent: and ... /Sauer /Sundstrand PV 20 Series, 90SeriesRexroth A11V Series,A10VSO Series, A4VG Series,A4VSO SeriesKAWASAK Series,K3V-63,K3V112,K3V140 ,K3V180spare parts Series (Piston shoe, cylinder ,retainer ...