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 6610-01-089-1018
NSN 5985-00-673-5831
NSN 5965-01-474-5654
NSN 5835-01-207-4484
NSN 6220-01-034-1231
NSN 5998-00-932-9792
NSN 6620-01-209-6909
NSN 5905-01-150-1894
NSN 5985-01-506-2480
NSN 5930-00-647-1064
NSN 6650-01-437-8852
NSN 5990-00-882-9162