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Continue to ChatRockin' Patent - Robert A. Moog's "Electronic High-pass And Low-pass Filters Employing The Base To Emitter Diode Resistance Of Bipolar Transistors" https://www.russellip.com/rockin-patent-robert-a-moogs-electronic-high-pass-and-low-pass-filters-employing-the-base-to-emitter-diode-resistance-of-bipolar-transistors/