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Format Image Remove constraint Format: Image Format Text Remove constraint Format: Text Rights No Known Copyright Remove constraint Rights: No Known Copyright Subject Insecticides Remove constraint Subject: Insecticides Subject Chemical industry Remove constraint Subject: Chemical industry Subject Corporations Remove constraint Subject: Corporations Subject Pyrethrum (Insecticide) Remove constraint Subject: Pyrethrum (Insecticide) Date 1941 Remove constraint Date: <span class='single'>1941</span>

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