Zenith Carburetter Co
of 40-42 Newman Street, London, W1, was a company making carburetters.
1910 Company founded.
1914 Listed as 'Zenith Carburetter Co Ltd (The), makers of the British made Zenith Carburetter. Offices, showrooms and works 40 and 42 Newman St W.' 
1914 Public company.
1922 Managing Director: J. Caillat. Employees: 400.
1937 Carburetter and petrol filter manufacturers. "Stromberg" Carburetters. "Zenith" Carburetters. 
1939 See Aircraft Industry Suppliers
1955 They joined with their major pre-war rival Solex Carburetters and over time the Zenith brand name fell into disuse. The rights to the Zenith designs was owned by Solex UK (a daughter company of Solex in France).
1961 Manufacturers of carburetters for all kinds of internal combustion engines. 900 employees. 
1966 Registered proprietor: The Bendix Corporation
Sources of Information
- 1915 Post Office London Directory
- 1937 The Aeroplane Directory of the Aviation and Allied Industries
- 1961 Dun and Bradstreet KBE
- 1963 Motor Show
-  Wikipedia