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of Shell-Mex House, Strand, London, WC2. Telephone: Temple bar 2373. Telegraphic Address: "Aerocessim, London".
of Treforest, Wales - site of factory.
For a full history see Oliver Simmonds.
1931 Oliver Simmonds visited the Paris Air Show and obtained a license for push-pull controls for the rest of the world. On return to the UK he formed Simmonds Aerocessories Ltd, and established a sub-contract manufacturer for the product in Birmingham.
1937 Listed Exhibitor - British Industries Fair. Simmonds Elastic Stop Nut, the universally successful lock-nut. Specialised Engineering and Aeronautical Accessories, including Simmonds Remote Controls, Simmonds Flexi-Clips, Simmonds Cowling Clips, Simmonds Navigational Instruments, Simmonds Jointing Compound, Simmonds Rifix. (Stand No. D.222) 
1937 Aeronautical and engineering accessories. "Simmonds" Elastic Stop Nut. "Simmonds-Corsey" Control. "Simmonds-Goudime" Navigational Instruments. 
1939 See Aircraft Industry Suppliers
1949 Company registered
1955 One of the most important suppliers of accessories to the aircraft, motor, chemical and other industries - products included world famous fastenings, instruments, filters. Advert (1954): FRAM filters, SPIRE speed nuts and fasteners, NYLOC fibre and PINNACLE self-locking nuts.
1962 - 1st May. The company changed its name to Firth Cleveland Fastenings Ltd.