Production:0110055

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year DMM operator production cumulative opening depth seam thickness method days emp
1923 Maples, Burckart & Hotkiss 600 80 4
1924 0
600
1925 Mapes & Kleher 32 10 2
1925b Maples & Kleckner 1,000 130 6
1,032
1926 Mapes & Co. 250 182 5
250
1882
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