73679495
Aug 20, 1987
SENSORS, DETECTORS, MATERIALS AND DEVICES REACTING DIRECTLY OR INDIRECTLY TO RUNNING WATER, TO LEAKAGES, DEPOSITS OR PRECIPITATION OF WATER OR WATER SYSTEMS; MATERIALS AND DEVICES FOR THE DETERMINATION AND/OR MEASUREMENT OF THE REACTION WITH WATER OF LIQUIDS OR OF SOLIDS CAPABLE OF FLOWING
Electrical and Scientific Apparatus