Chapter CXLIII. for the relief of Vincent de Rivafinoli, and others
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Chap. CXLIII.— An Act for the relief of Vincent de Rivafinoli, and others. May 28, 1830. *Be it enacted, &c., * That the Secretary of State be, and he is hereby, authorized and required to issue letters patent, in the usual form, toLetters patent to issue for a machine for washing ores, &c. Vincent de Rivafinoli, for himself, and as attorney in fact for Charles Harsleben, and William Davis, of the kingdom of Great Britain, as joint inventors of a machine for facilitating the washing of ores and alluvial soils, and the extraction of metallic substances and precious stones from ores, earth, sand, or other matter in which they may be found, upon his making oath that he verily believes that he, and the said Charles Harsleben and William Davis, are the true joint inventors and discoverers of the said machine, and upon his complying with all the provisions of the several acts of Congress relative to the issuing of letters patent for inventions and improvements, except so far as the said acts require, on the part of aliens, a residence of two years in the United States.
Approved, May 28, 1830.