• 1922: Formed as Alloa Shipbreaking Co., Rosyth & Charlestown • October 1926: Purchased Rosyth Shipbreaking Co. and gained their leases at
HM Dockyard, Rosyth • 1932: Sale of oxygen business to
British Oxygen Company • 1935: Metal Industries, Limited converted to public company and its subsidiary Brookhirst Switchgear Ltd., Chester • 1941:
Sentinel Waggon Works (1936) Limited • 1942: Igranic Electric Co., Bedford • 1945: Sentinel Waggon Works renamed to Sentinel (Shrewsbury) Limited • 1946: Reorganisation: Metal Industries (Electrical Group) Limited set up to organise all electrical business; Metal Industries (Salvage) Ltd., Faslane, to take over salvage business; Sentinel (Shrewsbury) Limited to run engineering business; Metal Industries, Ltd. to become holding company • 1947: Ferrous Light Castings, Warrington (completion of acquisition) • 1948: Fawcett Preston & Co. Ltd., Bromborough (founded 1758) • 1948: Cantle Switches Ltd. (closed 1958) • 1949: John Allan & Co. (Glenpark) Ltd. (est. 1898) • 1949: Cox and Danks Ltd. (see
Ernest Cox) • 1952 or earlier:
Hughes Bolckow Shipbreaking Company Limited,
Blyth • 1955: Formation of Metind Limited • 1955: Acquisition of resistor business from the
Rheostatic Company • 1955: Acquisition of Finney Presses Ltd. • 1956: Sale of Sentinel (Shrewsbury) Limited to
Rolls-Royce • 1957 or earlier: Shipbreaking Industries Limited • 1957: Closure of Metind Limited • 1959: Merger of Igranic with Brookhirst • 1958: Merger of Finney Presses Limited, Birmingham with Fawcett Preston • 1958: Sale of
British Oxygen Company Limited • 1958: Farmer Brothers (Shifnal) Limited • 1959:
Avo Ltd. and subsidiary Taylor Electrical Instruments Limited • 1959: Olaer France S.A., Paris • 1959: Towler Brothers (Patents) Limited • May 1959: International Rectifier Co. (Great Britain) Limited, at
Oxted, Surrey, joint-owned with
International Rectifier of California • 1960: Lancashire Dynamo Group, including: • Lancashire Dynamo Nevelin, Oxted • Lancashire Dynamo & Crypto, Trafford Park (sold to A.E.I., 1967) • Lancashire Dynamo Electronic Products • Foster Transformers, Wimbledon & Leatherhead • J. G. Statter & Co., Amersham • 1961 or earlier: New Eagle Foundry, Birmingham • 1961 or earlier: Cable Jointers, Crypton Equipment, Dynamo & Motor Repairs, Minerva Mouldings • 1961 or earlier: Metal Industries (Europe) S.A. • 1961: Closure of Metal Industries (Salvage) Limited • 1963: M.I. (South Africa) (Pty.), renamed from Brookhirst Igranic South Africa (Pty.) • 1963 or earlier: Dominion M.I. Limited, Montreal • 1964 or earlier:
Mattel-Marden Limited (joint owned) • 1964: Acquisition of 50% of International Rectifier Corporation Italiana S.p.A. • 1965: Acquisition of 50% of International Rectifier Europe S.A. • 1966: Industrial Automation Controls Ltd. (set up to coordinate Brookhirst Igranic and Lancashire Dynamo Electronic Products) • 1966: Disposal of Fawcett Preston • Aug 1967: Acquired by Thorn • 1970: Merged into Six Hundred Metal Holdings == Chairmen ==