Inventor
WAGBERG MICHAEL L
US4 patents
Patents
4 patentsUS4682758AJul 28, 1987
Disk/stem connection apparatus for butterfly valve
KEYSTONE INT30 citations90
US4651763AMar 24, 1987
Fire-safe ventilation valve
KEYSTONE INT11 citations71
US4649949AMar 17, 1987
Fireproof valve assembly and seal element for use therein
KEYSTONE INT11 citations71
US4648418AMar 10, 1987
Fireproof valve assembly and valve element for use therein
KEYSTONE INT10 citations71