Chicago : Engineering and Contracting Pub. Co. · leaf 1289
gest, the longest lived, the most sav-ing and the easiest-operating rock drill now sold. The VanadiumTungsten Iron in it has a tensile strength of 45,000 lbs., whereordinary iron has only 18,000. That difference tells the whole story. Order ONE, compare itswork with your other drills, and see if it…
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Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
