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of Southowram, Halifax
1911 Company first registered
1950 Company incorporated: tool makers; directors were various members of the Marshall family
1957 Patent application on "apparatus for grinding or sharpening rock drill bits or similar", the invention of James W S M Greaves and Geoffrey Wilson Marshall (patent granted 1960).
Halifax Tool Co. continued as a subsidiary of Marshalls (Halifax)
1988 Engineers, manufacturers of Halco drilling tools, "down the hole" hammers and rock-drill bits
1996 The engineering businesses were transferred to Halco Group. The Halifax Tool company changed its registered name to Marshalls Building Products Ltd, a subsidiary of Marshalls PLC, and ceased to trade as engineers.