BUY PRINT    An uncaptioned circa 1915 photo showing the assembly of what look like locks or latches inscribed "U.S. MAIL." Like any progressive workplace, it's equipped with spittoons. Harris & Ewing Collection glass negative. Update: These are "L.A. locks" being assembled at the Post Office Department's Mail Equipment Shops, 2135 Fifth Street N.E. See the comments for details. | Click image for Comments. | Home