Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,396 pages of information and 233,863 images on early companies, their products and the people who designed and built them.
of West Molesey
1994 Diffusion Environmental Systems was part of the Benson Group
Later part of Energy Technique Ltd
2003 Air Trade (Manufacturing) Ltd was incorporated
2009 Name changed to Diffusion BMS Ltd
2011 Name of Diffusion BMS Ltd was changed to Diffusion Environmental Systems Ltd