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 5998-01-182-3086
NSN 5998-01-474-3934
NSN 5915-00-036-3955
NSN 4140-00-191-1236
NSN 2925-00-964-7128
NSN 5835-00-977-1254
NSN 5990-01-421-5342
NSN 5905-00-539-4368
NSN 6645-00-140-5173
NSN 5985-01-506-8840
NSN 6220-00-988-1562
NSN 2925-01-228-6554