However a more restricted use may be preferred, and the internal instructions for cataloguing objects in the "Inventory of American Sculpture" at the Smithsonian American Art Museum say that "The terms "proper right" and "proper left" should be used when describing figures only".
China proper | Proper time | Proper plantar digital nerves of medial plantar nerve | Proper plantar digital nerves of lateral plantar nerve | Proper Filthy Naughty | Proper Crimbo | Necessary and Proper Clause | Mason Proper | China Proper | ''A Treatise of the Pleas of the Crown: or a system of the principal matters, relating to that subject, digested under their proper heads |