Scientific American, Volume XXIV., No. 12, March 18, 1871 / A Weekly Journal of Practical Information, Art, Science, / Mechanics, Chemistry, and Manufactures.

by Various

Plows.—John S. Hall, Pittsburgh, Pa., has petitioned for an extension of the above patent. Day of hearing, May 17, 1871.

Carriage Wheels.—James D. Sarven, New Haven, Conn., has petitioned for an extension of the above patent. Day of hearing May 24, 1871.

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