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 5975-01-118-5013
NSN 6110-00-179-9996
NSN 5965-00-439-6287
NSN 5835-01-350-0566
NSN 6150-01-081-3301
NSN 5960-00-351-1439
NSN 5835-01-303-6563
NSN 6320-00-845-3261
NSN 6620-01-566-0196
NSN 6620-01-222-2063
NSN 2925-00-789-1106
NSN 6135-01-329-7994