INSTRUMENTS AND AUTOMATIC DEVICES FOR ENVIRONMENTAL CONTROL, NAMELY, DIGITAL PNEUMATIC FLOW-METERS, DIGITAL PNEUMATIC LIMNOMETERS, PROBES FOR MEASUREMENT OF PHYSICAL AND CHEMICAL PARAMETERS, LIQUID SAMPLE TESTERS, DIGITAL GRAPHICS RECORDERS, DIGITAL SPRAY CONCENTRATORS, EFFLUENT-METER CHANNELS, RAIN GAUGES, SNOW GAUGES, LIMNIMETERS, CURRENT METERS, FLOW-METERS, AND SELF REGISTERING TIDE GAUGES

'automat':3 'channel':37 'chemic':23 'concentr':33 'control':7 'current':43 'devic':4 'digit':9,14,28,31 'effluent':35 'effluent-met':34 'environment':6 'flow':12,46 'flow-met':11,45 'gaug':39,41,52 'graphic':29 'instrument':1 'limnimet':42 'limnomet':16 'liquid':25 'measur':19 'meter':13,36,44,47 'name':8 'paramet':24 'physic':21 'pneumat':10,15 'probe':17 'rain':38 'record':30 'regist':50 'sampl':26 'self':49 'snow':40 'spray':32 'tester':27 'tide':51

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