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Jan 1954 - Rotary drill shown mounted temporarily on a truck, when undergoing tests by the mine's research dept.
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Jan 1954 - Rotary drill shown mounted temporarily on a truck, when undergoing tests by the mine's research dept.
["The Billingham Mine"]
(from Mine & Quarry Engineering [January, 1954])
Image Reference: L-00740-03-0065-F28
