Centuries: 2nd century - 3rd century - 4th century
Decades: 160s 170s 180s 190s 200s - 210s - 220s 230s 240s 250s 260s
Years: 214 215 216 217 218 - 219 - 220 221 222 223 224
Births
Deaths
... 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 ...