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 5975-00-574-9727
NSN 5945-01-130-8303
NSN 5930-01-150-9372
NSN 6135-01-607-5478
NSN 2925-00-295-8109
NSN 5990-01-644-3095
NSN 6220-01-091-9103
NSN 6150-00-094-2664
NSN 6620-00-106-6851
NSN 5915-00-230-4425
NSN 6610-00-982-6768
NSN 5915-00-923-7186