Tefal also manufactures linen care products such as Steam Irons and Garment Steamers. They were also used as dumb barges towed by steamers. Thirteen additional coastal steamers and small naval vessels were scuttled as well. These ships were known as paddle steamers. The Ottoman forces included seven frigates, three corvettes and two armed steamers. They attacked small fortified positions and boarded Brazilian river steamers. The ships were considered good steamers and good seaboats. Numerous river steamers, built in England, plied the Amur by the late 19th century. The main river is navigable for large ocean steamers to Manaus, upriver from the mouth. Large river steamers worked the river until quite recently. Swiss company CGN operates a number of paddle steamers on Lake Geneva. The Dutch Continental passenger steamers and were converted to LSIs. The two largest operators are Salters Steamers and French Brothers. This service was intended to replace the mail planes launched by catapult from trans-Atlantic steamers. Scuttled ships included the German steamers "Liebenfels", "Frauenfels", , "Crefeld", "Gera" and "Oliva".