Patent Office report for the year 1861 -- mechanical. Letter from the Commissioner of Patents, transmitting the mechanical report of the Patent Office for the year 1861. February 14, 1862. -- Laid on the table, and ordered to be printed. June 5, 1862. -- Resolved, that twenty thousand extra copies of the mechanical part of the Patent Office report for 1861 be printed for the use of the House, and ten thousand copies for the use of the Patent Office. [electronic resource]