Warning, this subject is old (1536 days without answer)
Ddey65
I found this old video of a late-1940's ephemeral film produced by AT&T about old-fashioned mobile telephones called (what else?) "Mobile Telephones."
https://www.youtube.com/watch?v=xDy2tHCPdk8&list=WL&index=96
Pre-1950 cars, trucks and buses are all over this one. Maybe somebody could add this video. Or maybe I can, once I find an exact year and other details.