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 5920-00-822-2327
NSN 7035-01-058-5668
NSN 5915-01-413-1633
NSN 5945-01-445-9498
NSN 2925-01-022-8332
NSN 5985-00-174-2019
NSN 5905-01-036-1204
NSN 5998-01-239-1206
NSN 5998-01-124-7569
NSN 5895-01-308-2795
NSN 5945-01-225-0350
NSN 5950-01-583-3026