(In March, May, July, and October, the ides is the 15th; in all other months it is the 13th. See calendar.)
... friction. The 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. Externa ...