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 6610-00-225-9886
NSN 6110-00-596-9124
NSN 6620-01-641-4122
NSN 5905-00-172-3490
NSN 6685-01-251-1556
NSN 5998-00-822-8741
NSN 5998-01-089-5412
NSN 6220-00-856-3583
NSN 6220-01-444-2918
NSN 5855-01-573-5035
NSN 5965-01-005-0341
NSN 6610-01-530-6730