electronic communication apparatus, namely, community antenna television security encoders and decoders; filters; notch filters; positive and negative traps; high-pass and low-pass filters; tiering filters; windowed high-pass filters; return path step attenuators; security shields for filters

'antenna':6 'apparatus':3 'attenu':37 'communic':2 'communiti':5 'decod':11 'electron':1 'encod':9 'filter':12,14,26,28,33,41 'high':20,31 'high-pass':19,30 'low':24 'low-pass':23 'name':4 'negat':17 'notch':13 'pass':21,25,32 'path':35 'posit':15 'return':34 'secur':8,38 'shield':39 'step':36 'televis':7 'tier':27 'trap':18 'window':29

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