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 5985-00-203-1200
NSN 5998-00-029-8795
NSN 4140-01-258-6301
NSN 5855-00-407-2801
NSN 5910-00-596-3179
NSN 6685-01-354-3560
NSN 6650-00-760-1385
NSN 6320-01-243-2276
NSN 5925-01-518-4474
NSN 5945-00-144-8073
NSN 6135-00-422-3967
NSN 5930-01-379-3370