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We suppose his treatise to have been published in mary countries. We think Tshernov to have been experimenting a long time before he established his critical points. They considered him a very experienced researcher. Any metallurgist knows the properties of an alloy to depend upon the properties of the elements is consist of. Experimentators have found the grain ctructure of a pure metal to change when a certain amount of a second metal is oldded to it. When designning a machine, the constructor expects it to be both efficient and riable.