English: Weapons factory Ing. František Janeček was built in Pankrác, Prague, in a place called "Na Zelené lišce", after the inn that Janeček bought with adjacent land at the very beginning of the 1920s. However, a subsequent change in the city's regulatory plan in 1922 severely limited the construction of factory buildings, which had to be built only as temporary structures, mostly of wood and sheet metal. (Jawa motorcycles were manufactured here from 1929).