'Trip Through The River Rouge Plant'.
Wild ass guess is c. late 30's.
Make popcorn, runs about a half hour.
I recently saw part of a documentary on what hell holes those old plants actually were... complete with roving 'security' goons, ready & eager to rough up employees caught talking, complaining and/or whatnot.
I bet they also had a steady stream of ambulances hauling off work related injuries (and fatalities).
Erik