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 5965-01-643-8470
NSN 6685-01-440-7214
NSN 6320-00-539-9283
NSN 5935-00-009-7216
NSN 5920-01-235-4141
NSN 5935-01-080-6702
NSN 5935-01-111-7646
NSN 5965-01-215-0993
NSN 6320-00-004-9158
NSN 5895-01-312-0112
NSN 5895-01-450-7344
NSN 6220-01-426-6922