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  • Johansson, S. R.; Johnsson, L. B.; Strid, K. G. A.
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    Method of Determining the Risk of Explosion of a Preferably Gaseous Medium and Apparatus for Carrying Out This Method.
    Industrilaboratoriet AB, Jonkoping, Sweden
    U.S. Patent 3,768,313, October 30, 1973, 13 p.