About this 3D model

A 3D model of U.S. Pat. No. 985,969 -- cutting edge 1907 hat-holding technology! "To all whom it may concern: Be it known that I, WILLIAM H. BURDEN, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented new and useful Improvements in Hat-Holding Devices, of which the following is a specification."