further proceedings. These preliminary examinations are made through the Branca Office of Messrs. MUNN .1 CO. corner of F and Seventh streets Washington by experienced and competent per sons. Many thousands of such examinations have been made througa THE VALIDITY OF PATENTS. Persons who are about purchasing patent property or patentees their patents should have their claims examined carefully by com petent attorneys to see if they are not likely to infringe some exist .0 1865 SCIENTIFIC AMERICAN INC., 1865-05-27
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