Mo. Rev. Stat. § 292.070
Doors to open outward, not to be bolted, when.
292.070. Doors to open outward, not to be bolted, when. — In all such establishments the main doors, both inside and outside, shall open outwardly, when the director, in writing, so directs; and no outside or inside door of any building wherein labor is employed shall be so locked, bolted or otherwise fastened during the hours of labor as to prevent egress.
(RSMo 1939 § 10187) Prior revisions: 1929 § 13227; 1919 § 6791; 1909 § 7832 CROSS REFERENCE: Doors to certain buildings to open outwardly, 320.070