INDEX OF INVENTIONS Granted in the Week Ending AND EACH BEARING THAT DATE. PRACTICAL HINTS TO INVENTORS. PATENTS CAVEATS ORNAMENTAL DESIGNS TRADE HARKS LABELS COPYRIGHTS., scientific american, 1879-02-15
INDEX OF INVENTIONS Granted in the Week Ending AND EACH BEARING THAT DATE. PRACTICAL HINTS TO INVENTORS. PATENTS CAVEATS ORNAMENTAL DESIGNS TRADE HARKS LABELS COPYRIGHTS., scientific american, 1879-02-15
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