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 6240-01-521-4822
NSN 5960-01-538-2082
NSN 5965-01-229-6995
NSN 5965-00-644-0339
NSN 5855-01-438-4588
NSN 5945-01-321-8911
NSN 4140-00-707-5963
NSN 6220-01-082-3982
NSN 2925-01-168-6253
NSN 6645-00-116-1409
NSN 6240-01-500-1714
NSN 6110-01-198-6154