Care of Machinery--Safety ot Workmen. The Poisonous Qualities of Chromate of Potash. Correspondence. Mechanical Equivalent of Mae., scientific american, 1871-07-22

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Care of Machinery--Safety ot Workmen. The Poisonous Qualities of Chromate of Potash. Correspondence. Mechanical Equivalent of Mae., scientific american, 1871-07-22

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