Redirected from 667 BC
Decades: 710s BC 700s BC 690s BC 680s BC 670s BC - 660s BC - 650s BC 640s BC 630s BC 620s BC 610s BC
Significant People
... the groove. (Compare with graphic below.) Since this friction force is essential for the device's operation, the groove must not be lubricated. The acceleration of the ...