NON-CONDUCTOR COVERINGS, _FOR STEAM BOILERS AND PIPES._
THE RAYMOND M'F'G CO., 642 West 52d St., 108 Liberty St., New York.
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Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 162 / 165 题