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Keith Blackman of Mill Mead Road, Tottenham, London N17.
1823 Original company founded by James Keith.
1890 Public company Blackman Ventilating Co.
1900/1 These two concerns were amalgamated under the title James Keith and Blackman Co.
1940 Advert for fan plants. 
1945 Advert for fans for the ventilation of buildings, ships, mines etc.
1961 Mechanical and electrical engineers and manufacturers of farm engineering equipment and industrial gas systems, both of the heating and high pressure types.
1968 April: Acquired by Slater Walker Securities.
1978 Mont Engineering acquired the business of Keith Blackman Gas Engineers, pioneers in the development of gas combustion equipment, specializing in compressors, air/gas mixers, and burners for all industrial and commercial applications.