Did Guglielmo Marconi know of Alexander Popov's 7 May 1895 coherer receiver demonstration before filing his own 1896 patent application, or did the two men arrive at similar designs independently from the same published coherer research?

Popov demonstrated a coherer based receiver to the Russian Physical and Chemical Society on 7 May 1895 but did not patent it or publish it outside Russia in a form clearly available to Marconi at the time. Both men were building on the same coherer research already published by Oliver Lodge and others, so the resemblance between their early receivers does not by itself prove either man copied the other.