It shall be unlawful for any person, firm or corporation to construct, operate, or use, or cause to be constructed, operated, or used, any trap-door, or opening whatsoever in any sidewalk, unless the same be equipped with removable metal guards, consisting of four metal posts, not less than three feet in height, and which metal posts shall be inserted in sockets placed in the sidewalk at the four corners of such trap-door or opening, with the tops of such posts connected by chains or bars, so that all sides of such openings shall be guarded. Such metal guards shall be removed as soon as said trap-doors or openings are closed.
(Added by Ord. 1.075, App. 10/11/38)