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Works and Repair Department: 114 Colindale Avenue, London;
Offices and Showroom:
of 33 Sackville Street, Piccadilly, W.I. (1947);
of 15 Sackville Street, London, W1 (1951)
William's sons, Frederick and William, worked in the business and took it over after their father's death.
1909 The Tilley High-Pressure Gas Syndicate Ltd. was incorporated as a Private company by Frederick Charles Tilley, William Henry Tilley and others  to manufacture high pressure gas lighting equipment using coal gas that had been developed by Frederick.
1915 The Tilley High-Pressure Gas company moved to Brent Street in Hendon
1919 The company started work with paraffin (kerosene) as a fuel for lamps.
1920 The company started making the lamp that made its name famous. It became so popular that Tilley became used as a generic name for a kerosene lamp in many parts of the world, in much the same way as Hoover is for vacuum cleaners.
During the 1920s the company had diversified into domestic lamps, and had expanded rapidly after orders from a number of railway companies.
Company name changed - the Tilley Lamp Co had been established by 1924 (see advert)
1937 The Tilley Lamp Co: Portable lamps, floodlights and searchlight projectors. "Tilley" Lamps. 
After the World War II fears about the poisonous effect of paraffin fumes, and freely available electricity reduced demand for domestic use.
1947 Name changed.
1949 Company made public.
1959 The company began diversification
1961 The company moved its operations from Hendon to Ireland, finally settling in Belfast.
1961 Manufacturers of "Tilley" paraffin vapour lamps, radiators and low pressure gas appliances. 360 employees. 
By 1989 the company was an unquoted subsidiary of Candlewood Holdings
In 2000 they relocated.
NB The Tilley Lamp is said by some to derive from John Tilley’s invention of the hydro-pneumatic blowpipe in 1813. John Tilley was an itinerant glass-blower and developed the device to aid his work but the connection with the Tilley lamp is uncertain.