Revision history of "Bell work"

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  • curprev 10:42, 19 November 2020Webref talk contribs 274 bytes +274 Created page with "# Derb. A system of working an ironstone measure by upward underground excavations around the shafts (raises) in the form of a bell or cone. <i>Fay </i> # A method used in wo..."

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