If you think electrically controlled locks were invented in the 21st century, think again. That's certainly what comes to mind when looking at it, and likely it rotates more than 1 degree (and lets the door open with the latch sticking out) when some solenoid is activated, if wired up and working for that purpose.

"With the latch sticking out" is why the frame is cut away in front of it (to the left in picture) which is, in fact, diagnostic. Rather than try to get building control wires to work on a door that moves, the strike on the frame that does not move is controlled by the building, but someone with a key can still operate the door latch, as needed.

If you think electrically controlled locks were invented in the 21st century, think again. That's certainly what comes to mind when looking at it, and likely it rotates more than 1 degree (and lets the door open with the latch sticking out) when some solenoid is activated, if wired up and working for that purpose.

"With the latch sticking out" is why the frame is cut away in front of it (to the left in picture) which is, in fact, diagnostic. Rather than try to get building control wires to work on a door that moves, the strike on the frame that does not move is controlled by the building, but someone with a key (or hitting the exit bar) can still operate the door latch, as needed.