Synonyms were used for: Kohle
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    Underground haulage with locomotives and mine cars

    Nailler, C.R. / Hagenbuch, C.C. | Engineering Index Backfile | 1946
    Keywords: Coal mines and mining

    Underground haulage with locomotives and mine cars

    Nailer, C.R. / Hagenbuch, C.C. | Engineering Index Backfile | 1947
    Keywords: Coal mines and mining