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Ancient knappers, working in the open air and with stone and bone tools, would have had less prolonged exposure to dust than in more modern workshops. [7] When gun flint knapping was a large-scale industry in Brandon, Suffolk, silicosis was widely known as knappers' rot. It has been claimed silicosis was responsible for the early death of three ...
Traders brought guns, metal tools, knives, saddles, hatchets, glass and ceramic beads, strouds (a kind of coarse blanket), ruffled and plain shirts, coats, clay tobacco pipes, brass and iron pots, and rum to trade for the furs and skins of deer, elk, bison, bear, beaver, raccoon, fox, wildcat, muskrat, mink and fisher. Town residents wore ...
When flint and steel were used, the fire steel was often kept in a metal tinderbox together with flint and tinder. In Tibet and Mongolia, they were instead carried in a leather pouch called a chuckmuck. In Japan, percussion fire making was performed using agate or even quartz. It was also used as a ritual to bring good luck or ward off evil.
Conrad Machine Co. is an independent manufacturer of etching and lithography presses, which it first began producing in 1956. The company was founded in 1945 by brothers Earl and Robert Conrad, and they offered general engineering services as well as their own products. The company moved to Whitehall, Michigan in 1973. [1] [2] [3]
The artifacts, found preserved in soil under a later lava flow and dated at 325,000–335,000 years old, were a mix of two distinct stone tool technology traditions: bifacial tools and Levallois tools. Daniel Adler suggests that the coexistence of bifacial and Levallois tools at the site provides the first clear evidence that local populations ...
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