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 6135-00-334-4500
NSN 6645-00-585-5932
NSN 5998-01-414-4255
NSN 5910-01-235-2855
NSN 7035-01-321-1555
NSN 6240-00-872-3365
NSN 6220-01-555-7860
NSN 5905-01-250-2396
NSN 6105-01-578-6318
NSN 5855-01-150-9970
NSN 4140-00-318-0159
NSN 5990-01-037-9801