Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 128,460 pages of information and 202,837 images on early companies, their products and the people who designed and built them.
Part of the Powell Duffryn Group
1967 Peter Hamilton Equipment and Hydraulic Machinery reported record sales of Hy-Mac hydraulic excavators
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
1974 Set up Hy-Mac Sales and Service to exploit home sales of excavators.
1979 Sold to German group IBH