Apparatus for controlling temperature and humidity at a selected range, namely, control systems consisting of digital thermostats, air conditioning, heating, ventilation and drying electronic control devices for use in the calibration of humidity and temperature measuring instruments

'air':18 'apparatus':1 'calibr':31 'condit':19 'consist':14 'control':3,12,25 'devic':26 'digit':16 'dri':23 'electron':24 'heat':20 'humid':6,33 'instrument':37 'measur':36 'name':11 'rang':10 'select':9 'system':13 'temperatur':4,35 'thermostat':17 'use':28 'ventil':21

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