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Company Directors & Staff Positions
| Name | Year | Position | Company |
| O'Callaghan, Charles | 1923 | Director | Albion Steam Coal Co., Ltd. |
| O'Callaghan, S. H. | 1923 | Director | Naval Colliery Co. (1897) Ltd. |
| O'Callaghan, S. H. | 1923 | Director | Blaenclydach Colliery Co., Ltd. |
| O'Callaghan, S. H. | 1923 | Director | Gwaun-Cae-Gurwen Colliery Co., Ltd. |
| O'Callaghan, Stephen H. | 1923 | Director | Albion Steam Coal Co., Ltd. |
| O'Connor, W. | 1923 | Agent | Bargoed Coal Co., Ltd. |
| O'Connor, W. | 1923 | Chief Engineer | Bargoed Coal Co., Ltd. |
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