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Dec 1936 - Starting a drill-hole in a typical rise
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Dec 1936 - Starting a drill-hole in a typical rise
(from Mine & Quarry Engineering [December, 1936])
Image Reference: L-00696-03-0065-F02
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Dec 1936 - Starting a drill-hole in a typical rise
Dec 1936 - Starting a drill-hole in a typical rise (from Mine & Quarry Engineering [December, 1936]) Image Reference: L-00696-03-0065-F02
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