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Rohm and Haas was an important chemical company that developed several useful insecticides for agricultural and public health purposes. The company became well known for its research on chemicals used to control harmful insects. One of its important contributions was the development of organophosphorus insecticides. These chemicals act mainly on the nervous system of insects and can provide effective _______ ____ __________ _________ ____ _________ _______ _____ __________.
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