Wool classing is done by a wool classer. Classification societies are also responsible for classing oil platforms, other offshore structures, and submarines. Her sons, Andrew and William, studied sheep breeding and wool classing. After leaving school he initially worked for the Department of Agriculture and studied wool classing. Taxonomies for classing Louisiana French have changed over time. United States Patent and Trademark Office is amongst the organisations classing diodes as active devices. The waves reached a height of , classing this tsunami as a small megatsunami. Classing himself an existentialist, Sartre wrote an extensive study of "Being and Nothingness".