Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 76
A pneumatic hammer, steel tubing. c Fishing-rod in steel tubing. … Bridge of steel pipe. 42 FORM-ARCHES are spiral instead of longitudinal. An eager quest for combinedstrength and lightness in the bicycle has ended in the choice oftubes spirally welded.
Inventions · Inventors
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