Pathé Marconi (this is a record company, not an imprint)
could very probably refer to the very same Pathé Records that was launched in 1894 after it was renamed in 1924, when co-founder Émile Pathé retired and sold Pathé records to Guglielmo Marconi.
In December 1928, the French and British Pathé phonograph assets were sold to the British Columbia Graphophone Company (forerunner of EMI prior to 1931). In July 1929, the assets of the American Pathé record company were merged into the newly formed American Record Corporation. The Pathé and Pathé-Marconi(?) labels still survive, first as imprints of EMI (the company formed in 1931) and now currently EMI's parent Universal Music Group.