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Improvement in Vibrating Propellers.

Patent for new and useful improvement in vibrating propellers.

Date: December 22, 1874

Creator: Macowitzky, Charles P.

Partner: UNT Libraries Government Documents Department

Improvement in Processes for Preserving Wood.

Patent for preserving wood from the ravages of marine insects (lines 7-8).

Date: July 28, 1874

Creator: Archer, Roger W.

Partner: UNT Libraries Government Documents Department

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