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Breisig, F, Method and Arrangement for Determining Crosstalk in Multicircuit Systems, United States patent 492 034, filed 13 August 1921, issued 30 June 1925.
Breisig, F, Method and Arrangement for Determining Crosstalk in Multicircuit Systems, United States patent 492 034, filed 13 August 1921, issued 30 June 1925.