Three different Foxboro slide rules: One is a plastic pocket-sized ‘valve and meter’ slide rule, with manual and in a case. Two are attractive Hemmi plastic ‘flow and valve’ rules—one with metric units; and one with English units, in an excellent leather case (and with a manual). The English-units rule, with two different shades of green on a white background, is one of the most stunningly beautiful rules that I know of, and will be a treasured addition to any collection.