COMMUNICATIONS RECEIVED. acknowledges with much pleasure the re ceipt of original papers and contributions upon the following subjects : D. L. S. Index of Inventions Letters Patent of the United Rat( s October 28 1873, scientific american, 1873-11-29
COMMUNICATIONS RECEIVED. acknowledges with much pleasure the re ceipt of original papers and contributions upon the following subjects : D. L. S. Index of Inventions Letters Patent of the United Rat( s October 28 1873, scientific american, 1873-11-29
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