Inventor

KOLL LARRY F

US4 patents

Patents

4 patents

US5271426ADec 21, 1993

Gate valve

CLARKSON CO79 citations93

US4688597AAug 25, 1987

Gate valve

CLARKSON CO58 citations93

US4846442AJul 11, 1989

Gate valve with lock ring

CLARKSON CO32 citations90

US5370149ADec 6, 1994

Line blind valve

CLARKSON CO38 citations89