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Showing posts with the label mines
Canary Bird And Mines

Canary Bird And Mines

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As long as the bird kept singing the miners knew their air supply was safe. Canaries were first br… Read more Canary Bird And Mines
Canary Bird In Coal Mines

Canary Bird In Coal Mines

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Refers to the former practice of taking caged canaries into coal mines. But not long ago the words… Read more Canary Bird In Coal Mines
Canary Bird Used In Mines

Canary Bird Used In Mines

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Even as gas detection technology improved some mining companies still relied on the canary method … Read more Canary Bird Used In Mines