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Old 05-15-2023, 09:57 PM   #42 (permalink)
freebeard
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Rajasthan, India, Okay; but when? 1980?

ANCIENT STONE CRAFT TECHNOLOGY: What Materials Did They Use? -- World of Antiquity

35:22 Techniques and Hand-Powered Machines

The first 35 minutes covers shaping limestone and granite with stone, copper and iron tooks. Then they show a tube drill that can reach 500RPM.
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