all original and fully functional c. 1950's american vintage industrial metallic gray enameled steel double-arm machinist workbench non-illuminated magnifier fabricated by the dazor mfg. corp., st. louis, mo. the versatile arm is equipped with two steel ball joints and swivel joint designed to provide a wide range of positions. three separate control knobs tighten the arm in position to reduce vibration. the original l-shaped steel bracket used for mounting on the top or side of a machine, bench or wall remains intact. the arm was designed and patented by jacob a. mehr of kirkwood, mo. the crown optical glass lens is original and intact. the dazor mfg. corp. history began in 1938 when harry dazey teamed up with washington university professor albert perbal, to create a company that would manufacture lamps. harry dazey began his career by producing butter churns, but when mr. dazey came up with the idea for the "floating arm" portable light he decided to restructure his company into a lamp manufacturer that specialized in task lights. initially, dazor lights were used simply as table lamps, but after the beginning of world war ii, dazor lamps became famous for their high efficiency and lower costs. the government found that dazor's lamps helped to conserve energy and were cheaper than the traditional costly overhead lighting. dazor was also the first fluorescent lamp manufacturer to combine the technology of the portable task light with fluorescent light bulbs. the technology was highlighted in a display by general electric at the 1938 world's fair. the lamp became popular quickly, especially among draftsman and architects of the time who found that the lights offered better visibility than traditional incandescent lights. total length 110". glass diameter 6-1/4".