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 6320-00-725-0754
NSN 6105-00-914-8323
NSN 6135-01-555-4283
NSN 5910-00-452-0436
NSN 5965-01-100-2591
NSN 6610-01-302-6347
NSN 5835-00-912-5656
NSN 6105-01-319-0141
NSN 6320-01-039-5891
NSN 2925-00-486-8640
NSN 6130-01-054-2139
NSN 5855-01-418-0089