Original linen-backed patent lithograph for the Hoover Company's improvements in the suction cleaner, one page, 12.5 x 10.25, May 19, 1932. The diagram features multiple views of the famous Hoover upright vacuum cleaner. The top border reads: "373,072 Complete Specification." The lower border features the printed text: "Charles & Read Ltd. Photo-Litho." The left border reads: "This Drawing is a reproduction of the Original on a reduced scale." Includes the printed British "Patent Specification" document, two pages on one sheet, which describes the invention as "an improved construction of machine in which the dusting tool is permanently attached without reducing its range of action." The specification sheet bears a "U.S. Patent Office Library" ink stamp on the first page. In fine condition. Though founded in Ohio, the Hoover Company also established a major base in the United Kingdom and dominated the electric vacuum cleaner industry throughout the 20th century—to the point that the 'Hoover' brand name became synonymous with vacuuming in the United Kingdom and Ireland.
