Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 132,950 pages of information and 210,197 images on early companies, their products and the people who designed and built them.
of Great Eastern Street, London.
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1892 Mentioned. 'John Smith Brown, Albert Brown, and Ernest Brown, trading as Brown Brothers, at 28 and 30, Great Eastern street, in the County of London, cycle fitting manufacturers'. Petition to wind up the Southern Cycle Co.
1897 The company was registered on 28 May, to take over the business of the firm of the same name, general hardware, cycle accessories, general warehousemen etc. Also H. A. Knox and Co. Directors are Herbert Chamberlain, Chairman; Thomas Edward Hill; and the three Brown brothers.
1901 August. Details of the 6-bhp motor.
1902 They produced the Brown motorcycles from 1902 to 1915
1914 Directors: Walter Chamberlain (Chairman), John S. Brown, Albert Brown and Ernest Brown (Managing Directors). Staff: About 350.
1914 Wholesale Cycle and Motor Material Manufacturers and Merchants. Specialities: motor cycle parts and accessories, cycle fittings and accessories, tools for motors etc. Employees 350. 
1919-23 Albert Brown is Chairman.
1922 Directors: Albert Brown (Chairman), Ernest Brown and J. Albert Thomson (Managing), John Brown, Frederick Brown and A. Cleveland.
1922 Products: "Duco" motor accessories and tools, "Bronko" cycle accessories and fittings, "Trippa" folding baby car; "Talmo" cars.
1927 Stand 223 at the 1927 Motor Cycle and Cycle Show at Olympia
1929-30 Ernest Brown is Chairman.
1936 Advertised aircraft components
1937 Established Brown Brothers (Aircraft) Ltd
1937 Aircraft fittings. 
1939 Brown Brothers (Aircraft) Ltd manufactured small components for aircraft in three separate specialised works. In addition, manufactured hydraulic and screw jacks for both civil and military aircraft, the larger types being capable of lifting machines weighing many tons. See Aircraft Industry Suppliers
1963 Motor Show exhibitor. Accessories and components; Garage equipment. Of Eastern Street, London.