two matching original hard to find early 20th century prismatic glass holophane company pendant lights with ribbed sun-purple glass shades

two matching well-maintained original early 20th century american vintage industrial factory office ceiling pendants containing deep bowl "holophane" reflectors comprised of prismatic glass, the shades or reflectors were fabricated around 1917 by the holophane glass co., inc., new york city, ny. the specially fitted ventilated shade fitters are comprised of yellow brass. the key sockets, chain and canopies are included. priced for the pair.