Electrical and electronic apparatus and instruments for the measurement, analysis and calibration of time, namely, timers; frequency references in the nature of stable oscillators for frequency calibration; time and frequency distribution systems, namely, frequency distribution amplifiers [ ; Global Navigation Satellite System(GNSS) constellation simulators comprised of computer hardware and electronic display interfaces ]

'amplifi':36 'analysi':10 'apparatus':4 'calibr':12,27 'compris':44 'comput':46 'constel':42 'display':50 'distribut':31,35 'electr':1 'electron':3,49 'frequenc':17,26,30,34 'global':37 'gnss':41 'hardwar':47 'instrument':6 'interfac':51 'measur':9 'name':15,33 'natur':21 'navig':38 'oscil':24 'refer':18 'satellit':39 'simul':43 'stabl':23 'system':32,40 'time':14,28 'timer':16

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