U.S. Patent Office. Assignment of Patent to Dana A. Dorsey   Publication Date:   1933-02-21 Creator:   U.S. Patent Office ( Signer ) Subjects.Display:   African American philanthropists -- Florida -- Miami -- History -- 20th century African Americans -- Florida -- Miami -- History -- 20th century Dorsey, Dana A. -- 1872-1940 Real estate developers -- Florida -- Miami -- History -- 20th century Source Institution:   Florida International University Donor:   Chapman, Dana U.S. Patent Office. Assignment of Patent to Dana A. Dorsey