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Maker of zip fasteners, of Birmingham.
The Lightning Fastener Department was formed within the general organisation of Kynoch Ltd.
1939 See Aircraft Industry Suppliers
A subsidiary of ICI.
1961 Manufacturers of Lightning and Nyzip zip fasteners. 
1965 Merged with the Opti group of West Germany; IMI retained 51% of the UK interests, 49% of the West German interests and 50% of other European interests
Presumably at some point this joint venture was renamed Optilon.