Scientific American 241 March 16, 1907. … Rock drilling machines or engines, drill or bit rotating mechanism for, Hellman & A medium weight, high class touring car with more new in Theory and Practice 845,952 Bayles and practically valuable features than ever before embodied 846,238 Roof guttc r, J. O'Dowd 845,973 Rotary engine, W. A. C.…
Supplement · Device · Railroad · Artificial · Scientific American · Patents · Celestial sphere · Water level · American supplement · Reinforced concrete · Wireless telegraph · Heat units · American march · American supplements · Vestibule day
Internet Archive · Public domain (published before 1931). Free to use for anything.
