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  • Beck, W.; Blackwood, J. C.
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    Metallic Salts of Tetrazoles Used as Blowing and Intumescent Agents for Thermoplastic Polymers.
    Stepan Chemical Co., Wilmington, MA
    U.S. Patent 3,873,477
    U.S. Patent 3,873,477
    March 25, 1975
    7 p.