A reservoir cap assembly of a vehicle master cylinder includes a cap body detachably mounted on an open end of a reservoir a caution plate on which directions or the like are inscribed, and a rivet having head and leg portions for respectively securing the cap body and the caution plate....http://www.google.com/patents/US3977105?utm_source=gb-gplus-sharePatent US3977105 - Reservoir cap assembly of a vehicle master cylinder
