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670s

Centuries: 6th century 7th century 8th century

Decades: 620s - 630s - 640s - 650s - 660s - 670s - 680s - 690s - 700s - 710s - 720s

Years: 670 671 672 673 674 675 676 677 678 679 680


Events:



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... must not be lubricated. The acceleration of the gyroscope is best when the precession of the gyroscope is supported and amplified by wrist motion. It takes a while until ...

 
 
 
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