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 6135-00-284-1406
NSN 5965-01-499-1528
NSN 5920-00-281-0246
NSN 5945-01-214-4136
NSN 2925-01-408-6205
NSN 7035-01-379-3795
NSN 6650-01-652-9024
NSN 6150-01-423-1432
NSN 6645-00-160-0503
NSN 6110-01-045-4160
NSN 6650-01-303-8351
NSN 6145-01-415-7220