Synonyms were used for: Kohle
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    Thirty rules for safe haulage

    Jones, D.C. | Engineering Index Backfile | 1946
    Keywords: Coal mines and mining

    Track-mounted surge cars speed entry development

    Jones, D.C. | Engineering Index Backfile | 1952
    Keywords: Coal mines and mining

    Transportation problem solved with belt conveyors

    Jones, D.C. | Engineering Index Backfile | 1951
    Keywords: Coal mines and mining