A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 6145-00-398-4405
NSN 5930-00-526-7645
NSN 5945-01-241-6469
NSN 5835-01-558-9444
NSN 5996-01-218-6118
NSN 6130-01-449-1178
NSN 6220-01-388-8425
NSN 5930-01-140-4722
NSN 7035-00-782-7046
NSN 5905-00-003-2981
NSN 5905-00-899-4382
NSN 6220-01-106-5433