Zebediela Estates
Atlas Petroleum Products Ltd.
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
