Except as provided under Section 3141.02 elevators, dumbwaiters and moving stairways legally installed before July 1, 1979 may be used without being reconstructed to comply with the provisions of OBBC, the Ohio Elevator Code and this Building Code governing new installations. Such existing installations shall be maintained in a safe operating condition, and shall be subject to the inspections and tests required by Section 3141.14. The Commissioner shall issue a Certificate of Operation for each existing elevator, dumbwaiter, moving stairway, amusement device or special equipment after such device has been inspected and found safe, which certificate shall be posted in the elevator car, or on, near, or plainly visible from the dumbwaiter, moving stairway, amusement device or special equipment.