"Perry Okey patent papers"@en . . . . . . . . "Seven patents granted to Perry Okey, an inventor from Columbus, Ohio, for automobile self-starter, saw-cutting machine, fluid-density meter, computing device, apparatus for feeding lines, refrigerating system, lens grinding machine; and correspondence regarding his claim for priority in an osmotic patent. Also includes three glass negatives of a device invented by Okey."@en . . . .