Transmitters of electronic signals; transmitters (telecommunication); sonar; signaling whistles; electro-dynamic apparatus for the remote control of signals; intercommunication apparatus; transmitters of electronic signals; optical communication instruments; limiters (electricity); modems

'apparatus':13,21 'communic':27 'control':17 'dynam':12 'electr':30 'electro':11 'electro-dynam':10 'electron':3,24 'instrument':28 'intercommun':20 'limit':29 'modem':31 'optic':26 'remot':16 'signal':4,8,19,25 'sonar':7 'telecommun':6 'transmitt':1,5,22 'whistl':9

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