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 6150-01-353-8144
NSN 5905-00-276-8597
NSN 2925-01-016-0876
NSN 5910-01-527-4541
NSN 5998-00-359-3652
NSN 5985-01-278-6838
NSN 5905-00-480-9705
NSN 7035-00-941-4949
NSN 5930-01-231-9366
NSN 5905-00-004-4425
NSN 6240-00-223-9107
NSN 6145-01-116-6729