Secure telephone systems primarily comprising mobile receivers, bases in the nature of telephone apparatuses for accessing fixed telecommunication networks, and computers provided with management software programs for ensuring the monitoring and the security of telecommunications

'access':16 'apparatus':14 'base':8 'compris':5 'comput':21 'ensur':28 'fix':17 'manag':24 'mobil':6 'monitor':30 'natur':11 'network':19 'primarili':4 'program':26 'provid':22 'receiv':7 'secur':1,33 'softwar':25 'system':3 'telecommun':18,35 'telephon':2,13

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