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 2925-00-997-1792
NSN 6240-00-788-6972
NSN 6320-00-908-6841
NSN 6610-01-506-3401
NSN 4140-01-389-6444
NSN 5930-01-386-1798
NSN 5910-01-536-9435
NSN 6145-01-605-4451
NSN 5975-00-626-5882
NSN 5999-01-156-9095
NSN 6220-01-223-8233
NSN 6130-00-234-8356