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Scientific American, Vol. 53, No. 25 (1885) (1885)
leaf 7
202 spur teeth, regulated to any desired degree. With steam at 60 which engage a pinion having 33 teeth and turning on of amusement in this city for some weeks past. It pounds per square inch, and coarse sand, a hole 2 inches in diameter can be perforated through plate glass a stud projecting from… … © 1885 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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