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 5925-01-290-0532
NSN 5965-00-937-1851
NSN 6130-01-476-8472
NSN 5985-01-491-8528
NSN 5960-01-460-0115
NSN 5920-00-740-3121
NSN 6620-00-602-5832
NSN 5990-00-964-6422
NSN 5835-01-442-6482
NSN 6105-01-439-3850
NSN 5835-01-198-6814
NSN 5930-01-045-6177