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 5895-01-613-0808
NSN 5998-01-621-3026
NSN 6620-00-930-5680
NSN 2925-01-502-2385
NSN 6135-01-349-6285
NSN 5985-01-587-5183
NSN 5920-00-203-5938
NSN 7035-00-286-6221
NSN 2925-01-004-5627
NSN 6685-00-810-8380
NSN 5965-00-977-5658
NSN 6645-01-076-4655