Polish naval tugs BG-2, BG-2, BG-3 and BG-4 according to a CIA report dated 8 October 1951

An item reported that the Polish navy possessed 4 tugs BG-2, BG-2, BG-3 and BG-4.

Source
The report was published on www.archive.org, document number CIA-RDP82-00457R008900070011-9