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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…
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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 by Russell Lee
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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 by Russell Lee

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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 by Russell Lee

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