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 5835-01-432-1277
NSN 5985-01-487-7530
NSN 6220-01-020-8703
NSN 6220-00-230-0807
NSN 7035-01-647-9698
NSN 5975-01-230-0254
NSN 5998-01-303-8378
NSN 6240-00-677-0305
NSN 5996-01-269-0982
NSN 6130-01-469-7244
NSN 6220-01-224-6415
NSN 5925-00-997-1298