Here is a spreadsheet of Miami Valley Inventors for the years 1814 to 1873. The spreadsheet contains 1800+ patent document numbers and 4000 individual names, some with historical notes. If indicated on the patent, assignment information and attorneys are also included in the record.
Counties: Butler, Champaign, Clark, Darke, Greene, Logan, Miami, Montgomery, Preble, Shelby, and Warren.
Cities: Dayton, Springfield, Xenia, Piqua, Troy, Sidney, Tipp City, Bellefontaine, Greenville, Hamilton, Middletown, Urbana, Oxford, Yellow Springs, and numerous smaller villages and localities.