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4655-M-500_Digitronics_4566_Paper_Tape_Spooler_1965.pdf 7323790
Digitronics_Acoustic_Coupler_Dec68.pdf 633749
Digitronics_NRZI_Peak_Detector_196906.pdf 1833031
US3449593_Signal_Slope_Derivative_Detection_Aparatus.pdf 693452
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