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1390s

Centuries: 13th century - 14th century - 15th century

Decades: 1340s 1350s 1360s 1370s 1380s - 1390s - 1400s 1410s 1420s 1430s 1440s

Years: 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399

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... below.) Since this friction force is essential for the device's operation, the groove must not be lubricated. The acceleration of the gyroscope is best when th ...