[5-Speed Power Engraver] The engraving tools can adjust 5 different speed ... Metal （Not for hardened steel）,Stone,Wood,Leather,Glass,PVC Pipe,DIY Crafts, The marks which you engrave can ...

Archaeologists in Marbella, Spain, have discovered a 200,000-year-old stone with engraving at the Coto Correa site.

Grosman's research bridges this gap by using computational analysis to integrate both technological and visual aspects, offering a comprehensive understanding of ancient engraving practices.