75421013
Jan 21, 1998
Jun 15, 1999
ELECTRONIC CONTINUOUS FLUID LEVEL CONTROLS AND SENSORS, NAMELY, LEVEL CONVERTOR TRANSMITTERS, LEVEL CONTROLLERS COMPRISING FLOATERS, BY-PASS LEVEL INDICATOR TRANSMITTERS, LEVEL DETECTORS COMPRISING ELECTRODES, MAGNETIC-CONTROL SWITCHES, ANALOGUE AND DIGITAL INSTRUMENTS, ULTRASOUND LEVEL TRANSMITTERS, VOLUME DETECTOR TRANSMITTERS
Electrical and Scientific Apparatus