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542

Centuries: 5th century - 6th century - 7th century

Decades: 490s - 500s - 510s - 520s - 530s - 540s - 550s - 560s - 570s - 580s - 590s

Years: 537 538 539 540 541 542 543 544 545 546 547


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Dynabee

... the "rolling" point, but the gyro will also be accelerated to a smaller extent by the slipping friction. The device is covered by US patents 3,726,146 (1973) and ...

 
 
 
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