Mo. Rev. Stat. § 292.040
No minor or woman shall be required to clean any part of the mill, gearing or machinery while it is in motion in such establishment, nor shall any minor under the age of sixteen years be required to work between the fixed and traversing or the traversing parts of any machine while it is in motion by the action of steam, water, electricity or other mechanical power; and no woman shall be required to work between the fixed and traversing or the traversing parts of any such machine, except the machine being operated by her.
(RSMo 1939 § 10184)
Prior revisions: 1929 § 13224; 1919 § 6788; 1909 § 7829