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Butte, Montana. Anaconda Copper Mining Company. First step in making bits for a pneumatic drilling machine is to heat a rod of the proper size; this rod is placed into machine which punches and forms the bit; this process is called drop forging. Bit plant of the Anaconda Copper Mining Company
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Butte, Montana. Anaconda Copper Mining Company. First step in making bits for a pneumatic drilling machine is to heat a rod of the proper size; this rod is placed into machine which punches and forms the bit; this process is called drop forging. Bit plant of the Anaconda Copper Mining Company

Lee, Russell · 1942-01-01 · photo, print, drawing

From the collection of Library of Congress. Free to download, adapt and use — no permission needed.

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silver bow countyunited statesnitrate negativesbuttemontana
Credit lineButte, Montana. Anaconda Copper Mining Company. First step in making bits for a pneumatic drilling machine is to heat a rod of the proper size; this rod is placed into machine which punches and forms . 1942-01-01. Lee, Russell. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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