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Engineering Sector Certificates
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1898 Hydraulic Joint Syndicate
1907 Fusion Welded Metals
1920s Greenwich Cable Works
1923 British Internal Combustion Engines
1927 Ohio Seamless Tube Company
1930s Electra Engineering & Development Company
1936 Mining & Engineering Agencies Ltd
1944 Jack & Heintz Inc.
1951 Marshall Sons & Co. (India)
1959 English Electric Company
1960 F Pratt & Co. Ltd
1968 Thomas W Ward Ltd
1970 Marshall Sons & Co. Ltd
1970 Babcock & Wilcox Company
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