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Con. Rand Brick and Pottery and Lime Co.
Pretoria Portland Cement Co., Ltd.
Union Castle Co.
Groenkloof Brick, Tile and Pottery Factory Ltd., Pretoria
Magista Slate Quarries, Ltd.
Vianini Ferro - Concrete Pipes (Brits.)
Imperial Chemical Industries
Rock Bursts
Low Grade Ore
Support of Workings
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