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 2925-01-197-7864
NSN 6240-01-533-8688
NSN 2925-00-654-3206
NSN 2925-01-625-6841
NSN 5920-01-010-3293
NSN 5835-00-468-3367
NSN 4140-01-284-9920
NSN 5998-01-519-4988
NSN 5990-01-242-9653
NSN 6685-01-442-4229
NSN 5985-00-922-1272
NSN 5910-00-419-3239