Secondary Means of Escape : Fixed stairways or fixed ladders of metal construction or portable flexible ladders, knotted man ropes, and other satisfactory devices. (RP 14G)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}