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 5975-01-330-7353
NSN 6620-01-597-7200
NSN 2925-00-456-7627
NSN 6110-01-271-4640
NSN 5925-00-135-0208
NSN 6145-01-533-5559
NSN 5975-01-163-2130
NSN 5999-00-248-7240
NSN 6240-01-394-8592
NSN 5975-00-210-4652
NSN 5925-01-367-4425
NSN 2925-01-466-0892