An item dated 7 December 1954 reported that the Mahart (Magyar Hajozasi Reszvenytarsasag) steam tug Kasan ? was sighted on the Danube off Vienna, Austria coming from Komarno, Czechoslovakia (nowadays Slovakia) towing an empty Soviet DDSG barge.
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A006200800008-0
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A006200800008-0