Inventor
MONCRIEF JR MARION L
US3 patents
Patents
3 patentsUS4387434AJun 7, 1983
Intelligent field interface device for fluid storage facility
PROCESS TECHNOLOGIES INC93 citations92
US4497033AJan 29, 1985
Multiplexed arrangement for connecting a plurality of transducers to a field interface device at a storage tank
PROCESS TECHNOLOGIES INC13 citations70
US4420810ADec 13, 1983
Apparatus for operating a motor driven device and testing state of series limit switch over same two-wire circuit
PROCESS TECHNOLOGIES INC5 citations59