4 Boxwood #36 1/2 folding rulers.  Stanley, Upson Nut, Lufkin, Chapin Stevens.  From top to bottom:  Stanley #36 1/2R, warranted Boxwood, initials DLF are stamped on front and 4 times on back, has pentagonal pin in hinge, otherwise ruler is excellent.  2nd is Chapin Stevens Co (C-S co) Pinemeadows, Conn USA, h, is a little dirty, there is a cut in the bar of the caliper (see pictures).  3rd is Upson Nut Co no. 36 1/2, as pentagonal pin in hinge, caliper pretty stiff to pull out and is wider than other rulers.  Bottom is Lufkin no. 372 also marked 36 1/2 warranted Boxwood, has square pin in hinge, there is a brass plate where pin on leg of ruler goes in.  Nice shape.  All rulers have their pins.