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Scientific American, Vol. 52, No. 12 (1885) (1885)
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try to have the copper at an even heat, over the enlarged interior area of the bore hole, due 0 and you will have a good job. If the article has had TuE youngest member of the Cotton Exchange in holes soldered in it, hold over the fire before using the larger quantity of the material to bé¢ mined… … © 1885 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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