So, I've learned:
you can see a Milburn Electric vehicle out at the Watkins Museum of History in Lawrence (on their upper floor, no less!)!
JOCO folks may be aware of the same Milburn family name used in the county, Milburn middle school (now closed), Milburn Country Club, Milburn neighborhood. They were active here in in Ohio building the EVs.
Also, I believe that the Eisenhower family EV is on display at the Eisenhower Presidential Library in Abilene.