Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 143,440 pages of information and 230,058 images on early companies, their products and the people who designed and built them.
Samuel Mercer and Co of Albion House, 4 Queen Street Place, London, EC4; of 198 Upper Thames St., London, E.C.4.
1937 Sheet metal stockholders. 
1938 Warehouses: Paddington New Yard, G.W.R. Alfred Road, Harrow Road, W.2.
1939 See Aircraft Industry Suppliers