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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 ...
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]
During the prehistoric times, the flint axe was a widely used tool for multiple different tasks. They were widely used during the Neolithic period to clear forests for early farming. The polished axes were used directly to cut timber across the grain, but some types (known as a Splitting maul ) were designed to split wood along the grain.
171–191 South High Street is a pair of historic buildings in Downtown Columbus, Ohio.The commercial structures have seen a wide variety of retail and service uses through the 20th century, including shoe stores, groceries, opticians, hatters, jewelers, a liquor store, and a car dealership.
For more than a century after its 1888 construction, the factory produced machine tools using original equipment. The structure itself is one of Columbus' most prominent factory buildings, and it was named a historic site in its centennial year. Berry Brothers is a brick building with an asphalt roof, set on a foundation of limestone.