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In what connection is the term "bulb of percussion" used?

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In what connection is the term "bulb of percussion" used?
posted Nov 20 by Anshika Utadi
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Stone tool-making
The bulb is a bulge on the surface of a stone that has been hit, by a blow applied at an angle, usually in the course of detaching a slice of the stone, usually flint, in order to shape it into a tool.

answer Nov 21 by Mohammad

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