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There are plenty of short braid screened wire link setups in 1920's radios especially in the audio sections, but I don't know if it would qualify as "coaxial cable" which would be designed as an RF transmission line with some characteristic impedance and termination for longer distance signal distribution.
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Surely "coaxial" refers to two metal sections having an "axis" in common "co"? Its about the construction of the cable - not about its purpose.
So in my book a piece of "screened cable" use for microphone applications in audio work is just as much coaxial as a TV aerial feeder. That sort of cable won't be given a characteristic impedance, but might well have a capacitance per metre rating.
Richard