| Name | Position Held | Dates | Colliery |
| MAYER J. | N.U.M.Secretary | 1961 to 1965 | Apedale |
| McGING J. | N.A.C.O.D.S. Secretary | 1947 tro 1960 | Holditch |
| MIDDLEBROOK C. | N.U.M.Secretary | 1956 to 1961 | Victoria (Black Bull) |
| MIDDLEBROOK C. | N.U.M.Secretary | 1963 to 1965 | Victoria (Black Bull) |
| MILLWARD J. | N.U.M.Secretary | 1953 to 1954 | Norton |
| MORTON J. | N.U.M.Secretary | 1968 | Parkhouse |
| MURRAY R. | N.U.M.Secretary | 1960 to 1963 | Florence |
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