Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,095 pages of information and 233,633 images on early companies, their products and the people who designed and built them.
WWI The Wireless Experimental Station was set up at Biggin Hill.
1917 Biggin Hill was established as an airfield for wireless experiments but then became part of the London Air Defence Area, responsible for defending London against air attacks; air-to-air and air-to-ground telephony systems were developed there 
1918 The Royal Air Force Instrument Design Establishment was set up at Biggin Hill
Developments in switches and radio direction finding were patented
1922 Moved to Farnborough