A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. J$3 per Annum. . _“ Improvement in Brick Making Machines. The Poison of the Cobra SPRAGUE'S IMPROVED BRICK MACHINE. 4. The Opal., scientific american, 1867-09-07
A WEEKLY JOURNAL OF PRACTICAL INFORMATION ART SCIENCE MECHANICS CHEMISTRY AND MANUFACTURES. J$3 per Annum. . _“ Improvement in Brick Making Machines. The Poison of the Cobra SPRAGUE'S IMPROVED BRICK MACHINE. 4. The Opal., scientific american, 1867-09-07
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