Oliver Pell Control
of Woolwich, London.
1897/8 Company founded. Charles Oliver started in business on his own account as an arc lamp manufacturer at Wilson Street, Finsbury, supplying lamps mainly to railway companies - presumably Engineering and Arc Lamps
Developed the magazine arc lamp using impregnated carbons which largely replaced co-axial arc lamps and revolutionized street lighting.
c.1910 Developed the Varley dry accumulator (perhaps based on the patent of Frederick Henry Varley?)
1920 Public company.
1922 Maker of electric distant control gear, electric water-heaters, meters, rotary snap switches carbon resistances, shunt coils, arc lamps, etc.
Maker of Varley components (see adverts).
1961 Coil winders and electrical engineers, manufacturers of electro-magnetic apparatus and devices, motors, relays and sub-assemblies to customer design. Specialists in electro-magnetic windings. 900 employees. 
Sources of Information
- The London Gazette 1 December 1922
- 1961 Dun and Bradstreet KBE