CONDUIT BOXES.
“Unilets” cast-iron outlet boxes with threaded openings for ½ to 3-inch rigid conduit. With covers of stamped steel or porcelain, or with porcelain bushings. Types 1-12 and 14. Approved April 13, 1908, for exposed work only. Manufactured by
Appleton Electric Co., 224 Washington St., Chicago, Ill.