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 6650-01-552-1397
NSN 4140-01-156-5333
NSN 6685-01-421-4070
NSN 6150-00-857-2349
NSN 5925-01-416-0913
NSN 6110-00-900-0199
NSN 5965-01-324-6583
NSN 6105-00-905-3135
NSN 6110-01-604-9806
NSN 5975-00-553-7151
NSN 5935-01-441-4485
NSN 5960-01-425-1454