A substantial collection of illustrated brochures, typed proposals, manuscript price lists, etc... promoting Keleket brand medical x-ray machinery manufactured by the Kelly-Koett firm of Covington, Kentucky (just outside Cincinnati). The earliest piece is a comprehensive, 56pp.proposal (typed and with printed illustrations interleaved) quoting a major installation in the U.S. Veterans Bureau Hospital in Cleveland from 1928 ; a circa-1940's binder holds two pages of printed introductory material and 8, large fold out diagrams illustrating floor plans of actual company installations in medical offices and hospitals ; and the balance of materials are illusrtrated pamphlets marketing machinery from the 1940's into the 1960's. 

WorldCat notes only two lone holdings of single, contemporary Keleket brochures (one at the Bakken Library and Museum in Minneapolis, the other at the College of Physicians of Philadelphia), suggesting this is scarce material to encounter, particularly in anything resembling a sizable collection.