E. and F. Richardson
1937 Varnish and enamel manufacturers. Efrilac Lacquer, Paints and Varnishes.
1942 Mention of E. and F. Richardson of Buckingham.
1946 Mention of Francis Michael Richardson age 30, a director of the company.
became Sigma Coatings
Sources of Information
- 1937 The Aeroplane Directory of the Aviation and Allied Industries
- Buckingham Advertiser and Free Press - Saturday 10 October 1942
- Buckingham Advertiser and Free Press - Saturday 12 January 1946