| http://www.w3.org/ns/prov#value | - sing connected to said amplifier means and adapted to pass signals within the frequency band of said preselected pulse repetition rate and to attenuate lower frequencies including 120 Hz and that of said vertical frame rate and to attenuate higher frequencies including said horizontal scanning frequency; (e) retriggerable monostable multivibrator connected to receive said receiver pulses from said
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