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 4140-01-541-1271
NSN 6320-01-143-3597
NSN 7035-01-106-3476
NSN 2925-00-633-7223
NSN 5905-01-099-0925
NSN 5920-00-823-0969
NSN 4140-00-413-0877
NSN 5965-01-656-9004
NSN 2925-01-022-3181
NSN 5945-01-608-5803
NSN 6610-01-534-7917
NSN 5905-00-035-8981