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 5925-01-422-6783
NSN 5990-00-676-9520
NSN 6135-00-676-5807
NSN 6620-01-182-0282
NSN 5920-01-303-6841
NSN 5905-01-025-2350
NSN 6645-00-140-5173
NSN 5990-00-831-5359
NSN 5965-00-408-5501
NSN 6240-01-633-9357
NSN 6610-00-835-7683
NSN 5895-01-241-0407