TO CORRESPONDENTS. Now is Your Time. Patent Office. wILLIAM HOVEY'S PATENT SPI AMERICAN AND FOREIGNPATENT A LIST OF VALUAB LE SCIENTIFIC AND MECHANICAL BOOKS Patent Claims. 0pRUSH'S IMPROVED DOUBLE-ACT Important Notice to us I W 00D'S PATENT SHINGLE MA Terms of Advertising. Tho ATENT METALIC OIL FOR MACHI ligATTEAWAN MACHINE WORKS.- F CLOCKS FOR CHURCHES PUBLIC wOODWORTH'S PLANINGMACHINE ra-euirlfrN 1, scientific american, 1850-08-31
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