Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,151 pages of information and 233,681 images on early companies, their products and the people who designed and built them.
1969 William Park and Co (Forgemaster) was merged with Dobson Hardwick, both of whom were substantial makers of roof props for underground mines; the new company Dobson Park Industries would be owned 50:50 by the 2 constituent companies
1973 Acquired Powell and Co, of St Helens, makers of waste paper handling machinery, and Markon Engineering, of Oakham, makers of alternators and generators
1974 Acquired Powerlite Group of New South Wales
1975 Had 60 percent of the NCB's business for powered roof supports, which accounted for 60 percent of the NCB's capital spend underground
Diversified into electronic control systems, toys and plastics in a vain attempt to stem find a source of growth
1993 Longwall International was formed by merging the mining equipment interests of the Dobson Park Group with Meco International. Also sold the power tools business, leaving the operations of Dobson Park only half as large as they were in 1991
1995 Acquired by US company Harnischfeger Industries which wanted to merge the company with its Joy Manufacturing subsidiary which made mining equipment