2a).

(d) Where used withcombination horizontally sliding and swinging doors, the sliding and swinging panels shall be equipped with interlocks. Exception: Where the sliding and swinging panels are interconnected in conformity with the requirements of Section 110, Rule 110.10b, the interlock may be omitted on the swinging panel provided that the interlock on the sliding panel is so designed and installed that the car cannot be operated unless the sliding and swinging panels are both in the closed position as defined in