of Sidcup, Kent
Maker of fittings and accessories for the heating ventilating and sheet metal industries
1967 'Richard Crittall Holdings have acquired all issued share capital of Zest Equipment Co'[1]
1968 Richard Crittall was acquired by Crown House which formed a new subsidiary, Wheeler Crittall Berry for the contracting companies that were part of the group[2]
1973 Wheeler Crittall Berry was joined with Furse Installations to become Crown House Engineering[3]
1986 Crown House became part of Coloroll.
1987 Thomas Robinson Group acquired Crown House Zest from Coloroll