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 5895-01-538-5543
NSN 5990-00-085-0829
NSN 5855-01-100-3272
NSN 6610-01-555-8791
NSN 5999-01-069-9669
NSN 5998-00-540-9571
NSN 5905-01-381-0638
NSN 5990-01-474-3477
NSN 5975-00-541-8531
NSN 5950-01-444-1789
NSN 5945-01-291-6420
NSN 7035-01-451-6421