The Conventions concerning Employment of Women during the Night are conventions drafted by the International Labour Organization (ILO) which prohibit women from performing industrial work during the night. The first convention was adopted in 1919 (as C04, shortened Night Work (Women) Convention, 1919) and revised versions were adopted in 1934 (C41, Night Work (Women) Convention (Revised), 1934) and 1948 (C89, Night Work (Women) Convention (Revised), 1948). A protocol (P89, Protocol to the Night Work (Women) Convention (Revised), 1948) to the convention was adopted in 1990 allowing for easing of the restriction under conditions. As of April 2011 the conventions had 27, 15, 46 (undenounced) ratifications respectively. The protocol was ratified 5 and denounced by 2.