File:Collier's 1921 Coal - mining with an electric drill.jpg
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![File:Collier's 1921 Coal - mining with an electric drill.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Collier%27s_1921_Coal_-_mining_with_an_electric_drill.jpg/800px-Collier%27s_1921_Coal_-_mining_with_an_electric_drill.jpg?20171025182940)
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