JD401 wroteAHA, so a commercial item? Possibly other side would be a “crash bar”?
(More photos attached, just or info’s sake)
Yes, but proper terminology is exit device:
exit device
n. a door lock/latch mechanism which releases in the direction of exit travel via a bar or panel extending across the major width of the door*
*from LIST Council Professional Locksmith Dictionary
Eaton Yale & Towne on key bow would date it from 1963-1979.
Pete Schifferli
[unknown]