MAY 2 1868. Improved Copy Holder for Compositors. HILBERT'S SELF-ACTING LUBRICATOR. 41. Spontaneous Generations. Process for Casting Steel under High Pressure. Optical Illusions LA FRANCE'S PATENT COPY HOLDER AND GUIDE., scientific american, 1868-05-02
MAY 2 1868. Improved Copy Holder for Compositors. HILBERT'S SELF-ACTING LUBRICATOR. 41. Spontaneous Generations. Process for Casting Steel under High Pressure. Optical Illusions LA FRANCE'S PATENT COPY HOLDER AND GUIDE., scientific american, 1868-05-02
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