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 4140-01-324-6331
NSN 5910-01-383-7135
NSN 6685-00-444-5000
NSN 6135-01-167-7604
NSN 5905-01-157-9531
NSN 5920-00-899-3384
NSN 5920-01-160-0057
NSN 5920-00-851-0216
NSN 5910-00-160-7811
NSN 5920-01-256-3219
NSN 5985-00-919-7213
NSN 6150-01-062-0853