Does the elevator produced by 19 have a car door lock?

The elevator produced by 19 has no car door lock. The patent of elevator car door lock is 20 19-08-30, and the date of authorization announcement is 2020-05- 15, so elevator car door lock is not used in 20 19. Elevator car door lock is an elevator door lock, which is the locking device of car door and landing door (referring to landing door). Under normal circumstances, you can't open the door without using a device to protect people from being cut or hurt. It is an important safety device of elevator.