Stan Hywet Rubber Objects belonging to Charles Goodyear
The folks at the Stan Hywet house have a number of rubber items in their collections connected to the Seiberling family that may be of interest. Few were on display and many are small so would have been hard to examine anyway. FYI, if there were objects on display at Stan Hywet, they have a catalogue entry for each item and can tell you about them if you contact them.
Rubber Objects Lists SHH Collection