Presumably connected with Frank Trounson Hearle?
WWII Manufactured parts for the De Havilland Mosquito 
1952 Supplied stem-filter draw-in valves for the Comet aircraft
1955 The company had been voluntarily liquidated; a meeting of the Members of the company were held at the offices of The de Havilland Aircraft Company Limited, at Hatfield
Sources of Information
- ↑ Mosquito by C. Martin Sharp and Michael J. F. Bowyer. Published by Crecy Books in 1995. ISBN 0-947554-41-6
- ↑ Flight 25 April 1952
- ↑ London Gazette 28 October 1955M.