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Sand Stone Gringing Wheel

An assemblage of sandstone grinding wheels , for grinding and sharpening blades and files, was also recorded. Specific relationship between blood lead and air lead in the crystal industry … for grinding • Polyvalent sandstone grinders: 21 polyvalent workers with a mean age of 37.1 years (SD: 8.9) and a mean length of service of 15.0 years ...

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