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 5895-00-944-4810
NSN 5998-00-158-3192
NSN 6685-01-121-6892
NSN 6650-01-534-8357
NSN 6650-01-599-5668
NSN 5925-01-191-6498
NSN 6645-01-633-1852
NSN 5915-01-026-8569
NSN 5998-01-334-4167
NSN 6105-00-647-3955
NSN 7035-01-317-7186
NSN 6145-00-153-2818