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 5925-01-025-7007
NSN 6130-01-092-6242
NSN 5930-01-429-8443
NSN 5985-01-487-4984
NSN 6610-00-983-4482
NSN 5985-01-578-6915
NSN 4140-00-269-3189
NSN 6320-01-255-2096
NSN 5998-01-328-6531
NSN 5930-01-535-5121
NSN 6145-00-141-8095
NSN 5915-00-267-9857