The Hungarian Meszhart tug Gyoer active on the Danube according to a CIA report dated 10 June 1955

An item dealing with the Danube shipping movements reported that on 28 February 1955 was sighted off Vienna, Austria the Hungarian Meszhart tug Gyoer while towing tankers loaded with naphtha towards Bratislava, Czechoslavakia.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A007000090002-6