Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,366 pages of information and 233,518 images on early companies, their products and the people who designed and built them.


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Construction machinery

Part of the Powell Duffryn Group

1962 Rhymney Engineering Co launched the first British all-hydraulic crawler mounted excavator through Peter Hamilton Equipment Ltd, which was marketed as Hy-Mac[1]

1967 Peter Hamilton Equipment and Hydraulic Machinery reported record sales of Hy-Mac hydraulic excavators[2]

1970 Rapid growth had led to sales of £10 million/year with a wide range of models but this had overstretched the company which was trading at a loss so the parent company had to make changes in the business[3]

1971 Whitlock, maker of earth movers, was sold to Powell Duffryn which would integrate it with Hy-Mac[4]

1974 Set up Hy-Mac Sales and Service to exploit home sales of excavators.[5]

1979 Sold to German group IBH[6]

See Also


Sources of Information

  1. The Times, Aug 06, 1970
  2. The Times, Aug 14, 1967
  3. The Times, Aug 06, 1970
  4. The Times, Jan 13, 1972
  5. The Engineer 1974/04/18
  6. The Times, Nov 23, 1979