Observing systems and instruments, namely thermometers, barometers, altimeters, wind velocity gages, humidity gages and combinations thereof, for measuring and monitoring atmospheric conditions including air temperature, variations in air temperature, barometric pressure, variations in barometric pressure, humidity, changes in humidity, density, changes in density, altitude and changes in altitude

'air':24,28 'altimet':8 'altitud':44,48 'atmospher':21 'baromet':7 'barometr':30,34 'chang':37,41,46 'combin':15 'condit':22 'densiti':40,43 'gage':11,13 'humid':12,36,39 'includ':23 'instrument':4 'measur':18 'monitor':20 'name':5 'observ':1 'pressur':31,35 'system':2 'temperatur':25,29 'thereof':16 'thermomet':6 'variat':26,32 'veloc':10 'wind':9

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