lot of antique architectural white porcelain pendant light/lamp sockets w/pull chains

Lot of two old, late early 1900s vintage, white ironstone porcelain lamp sockets for hanging pendant lights. The sockets both have beaded pull chains. One of the sockets is marked "P & S" (Pass & Seymour) and the other lamp socket is not marked with a makers name. The sockets are both for a standard Edison base light bulb (This is the standard household light bulb and was originally created for the Mazda light bulb). They are in very nice vintage condition.