If you are interested in primary materials, Special Collections at  
the Morris Library at the University of Delaware has a fairly large  
collection of coffin and casket manufacturers Trade Catalogs from the  
late nineteenth to the early twentieth century. If I remember  
correctly, the catalogs are mostly from East Coast manufacturers, but  
few might be from Ohio? You can check the listings on the library's  
website (www.lib.udel.edu) I heard that they recently copied material  
for a project in California, but I don't know what the cost might  
have been. Maybe they made extra copies, or wisely scanned images?

Tim Mancl, RPA
Heite Consulting
Little Creek, DE