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 5935-00-275-6537
NSN 5935-01-370-2349
NSN 6610-01-469-9384
NSN 2925-01-025-0082
NSN 5996-01-452-9489
NSN 6145-00-823-6215
NSN 6620-01-031-3989
NSN 5945-01-100-5482
NSN 5985-01-183-7466
NSN 5990-01-304-5680
NSN 6145-01-022-8220
NSN 5975-00-116-0803