Centuries: 14th century - 15th century - 16th century
Decades: 1380s 1390s 1400s 1410s 1420s - 1430s - 1440s 1450s 1460s 1470s 1480s
Years: 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
... by the slipping 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 ...