Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 134,038 pages of information and 213,154 images on early companies, their products and the people who designed and built them.
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.
1968 Recently extended works to make marine propellers up to 36 feet in diameter with a finished weight of 80 tons