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Subject Pyrethrum (Insecticide) Remove constraint Subject: Pyrethrum (Insecticide)

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    • 1940

    Advertisement for D.H.S. Activator, a trademarked name for Ethylene glycol ether manufactured and sold by the Hercules Powder Company to increase the effectiveness and reduce the manufacturing costs of pyrethrum and…

    • 1940

    Advertisement for D.H.S. Activator, a trademarked name for Ethylene glycol ether manufactured and sold by the Hercules Powder Company to increase the effectiveness and reduce the manufacturing costs of pyrethrum and…

    • 1940

    Advertisement for D.H.S. Activator, a trademarked name for Ethylene glycol ether manufactured and sold by the Hercules Powder Company to increase the effectiveness and reduce the manufacturing costs of pyrethrum…