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 6240-01-262-2039
NSN 6645-00-857-0410
NSN 5990-01-337-9859
NSN 6110-01-128-1319
NSN 6110-01-215-9586
NSN 5930-00-337-6763
NSN 5960-00-649-9373
NSN 6620-01-515-2790
NSN 5950-01-424-0257
NSN 4140-00-448-1676
NSN 6320-00-676-9387
NSN 5945-01-426-8747