Tungstone Products
Tungstone Accumulator Co, of Salisbury Sq, Fleet St, London
1925 Introduced a design of accumulator using plates made from pure lead (rather than a lead-antimony alloy) and replacing the wood widely used for spacers[1]
1925 Tungstone accumulators were entirely manufactured by machines[2]
1925 Walter Haddon of London patented a design of accumulator casing and, with James McDonald Burnett of Weston by Welland, patented a design of plate/grid for accumulators
1928 Accumulators were made at the Tungstone High-Pressure Die Casting Works at Market Harborough[3]
1938 Private company formed: Tungstone Products.
1953 Became part of Haddon Group
1962 Tungstone Products Ltd, part of the Haddon Group, supplied stationary lead-acid cells and components for powering communications, to the General Post Office[4]
1963 Motor Show exhibitor. Batteries
By 1986 was part of Hawker Siddeley[5]