PATENT BENDING ROLLS,
For Heavy Punches, Shears, Boiler Shop Rolls, Radial Drills, etc., send
to
HILLES & JONES, Wilmington, Del.
* * * * *
Scientific American, Volume XLIII., No. 25, December 18, 1880 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 90 / 165 题