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thofized and required to issue letters pa- tent, in the usual form, to John Powell, for his invention of machine q for the pur- pose of separating the metal from gold ore, and the aurIferous earth Of aliuvlai depos- ites," upon his compliance with all the provisions of the existing laws, except so far as they require, on the part of aliens resd ence of two years in the United States.

 Approved: Feb. I2. 1881. 2l