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 6145-00-280-8488
NSN 6685-00-184-3894
NSN 6240-00-053-1421
NSN 5975-01-088-7470
NSN 6620-01-096-3723
NSN 6320-00-646-3311
NSN 6135-01-643-5809
NSN 5925-00-177-2481
NSN 6645-01-256-6376
NSN 5999-00-869-5485
NSN 6610-01-578-7771
NSN 5985-01-305-7305