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 6220-01-543-0062
NSN 6135-01-175-4589
NSN 5935-01-138-4973
NSN 4140-01-549-4647
NSN 6130-01-144-5978
NSN 5945-01-601-2677
NSN 5975-00-331-7061
NSN 5915-01-444-4069
NSN 5999-01-335-5750
NSN 6685-01-182-9315
NSN 6320-01-129-9656
NSN 5960-01-346-1201