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 6130-00-972-3069
NSN 5835-01-412-6901
NSN 6150-00-423-9804
NSN 2925-01-281-6403
NSN 4140-00-092-1534
NSN 5996-01-218-0522
NSN 5965-00-726-3168
NSN 2925-01-583-5619
NSN 6620-00-179-9079
NSN 5965-00-189-9394
NSN 5855-00-411-8688
NSN 6620-01-306-1347