Canlaon Volcano[?], in the northern part of the island is a semi-active volcano and overlooks Bacolod City.
... device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang. External links www.gyrotwister.de ...