Radio Apparatus

“My invention relates to apparatus for reducing in circuits, and particularly receiving circuits, of systems utilizing high frequency or radio frequency currents, as in radio or analogous systems utilized for telegraphy, telephony or other purposes, the effects of undesired or parasitic currents locally produced in the apparatus, or caused or produced by static, atmospherics, strays or other natural electrical disturbances, or due to electro-radiant or other energy, particularly when such effects are due to current or currents of frequency higher than the current or currents representing the desiredsignal, message or control.” A.A.Kenthttps://digitalcommons.wpi.edu/patents/1002/thumbnail.jp