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 2925-01-398-4312
NSN 6240-00-283-3553
NSN 6645-01-535-0719
NSN 5960-00-812-7166
NSN 6650-00-320-8683
NSN 5960-01-061-9166
NSN 5985-01-620-0759
NSN 4140-01-133-9011
NSN 6135-01-487-6275
NSN 6105-00-526-8144
NSN 6620-01-514-7786
NSN 6220-01-612-4222