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1904 The private company J Stone and Company Ltd was registered to acquire the business of J. Stone and Co, brass, copper and iron workers, and mechanical and general engineers, of Deptford.
1950 Reconstruction of J. Stone and Co as a holding company; formation of 2 subsidiaries to handle the business J. Stone and Co (Charlton) Ltd (railway air conditioning) and J. Stone and Co (Deptford) Ltd (marine propellors); the existing subsidiaries Stone-Wallwork Ltd and Stone Platt Engineering Co Ltd, which had complementary activities, would be merged into one, namely Stone-Wallwork, which would handle the mechanical engineering products; Stone-Platt would be liquidated. The existing 50 percent holdings in Light Metal Forgings Ltd and Stone-Fry Magnesium Ltd would be maintained.
1958 Scheme of arrangement to effect a merger between Platt Brothers and Co (Holdings), makers of textile machinery, and J. Stone and Co (Holdings); Stones became a wholly owned subsidiary of Platts; the company name was changed to Stone-Platt Industries.
1959 The principal subsidiaries were:
and associated companies:
1960 Formation of Stone-Manganese Marine to handle overseas sale of marine products of Manganese Bronze and Brass Co, J. Stone and Co (Propellors), Bulls Metal and Marine, and Steven and Struthers.
1964 J. Stone and Co (Charlton) was a member of the Stone-Platt group.
1970s Stone-Platt Fluidfire supplied fluid-bed boilers.
1974 Mr. Derrick Willingham was appointed finance director who succeeded Mr G. G. Buckley.
1980 Company defaulted on bank loan; major problems due to loss on textile machinery operation Platt Saco Lowell; sold pumps division to raise cash.
1981 Sold propellor division.
1982 Banks unwilling to put in further funds; company declared bankrupt; management buyout of the electrical division.
Problems with an overseas contract forced the company to sell one of its more profitable subsidiaries
1991 FKI sold the Stone air conditioning business to a Japanese company