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Horizontal boring mill operators
Geo. H. Sampson's New England Agency for Gunpowder for Sporting and Blasting
Martha Horne, O-20-1 machine operator
Dorothy Henderson, O-21-10 machine operator
Air Driven Drilling Machine
C.F. Waters, P-13-7 boring mill operator
Blast furnace showing Feld Washers, Bethlehem Steel Company (Lackawanna, N.Y.)
Miner's Using Modern Equipment
Milling and drill press operators
David Kelso, drill grinder
Apprentice laying out work for drilling
Drilling rig on Guest River, Virginia
Old Time Mining Methods
Apprentice operating boring mill