German screw steam tug Joh. Küppers 4 built at Rotterdam, Netherlands in 1910 according to the Dutch magazine Scheepvaart dated 30 December 1910

A list of the ships launched in 1910 reported the German screw steam tug Joh. Küppers 4 built by N.V. Machinefabriek en Scheepswerf van P. Smit Jr., Rotterdam, Netherlands for account of an owner at Duisburg, Germany.