Inventor
HETZEL HELMUT
DE3 patents
Patents
3 patentsUS4848402AJul 18, 1989
Rotary slide valve for hydraulic auxiliary power steerings
ZAHNRADFABRIK FRIEDRICHSHAFEN27 citations91
US5107752AApr 28, 1992
Rotary gate valve for hydraulic servo-assisted steering systems
ZAHNRADFABRIK FRIEDRICHSHAFEN8 citations71
US5086687AFeb 11, 1992
Rotary slide valve for hydraulic auxiliary power steering
ZAHNRADFABRIK FRIEDRICHSHAFEN9 citations71