Events
Births
Deaths
Holidays and observances
January 31 - February 2 - January 1 - March 1 - Historical anniversaries
... 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.d ...