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 6130-01-400-1385
NSN 5925-01-104-8421
NSN 5835-01-074-7593
NSN 5915-01-467-0113
NSN 5915-00-655-1804
NSN 5855-00-233-2366
NSN 6150-01-250-3654
NSN 6650-01-467-8818
NSN 5999-01-653-6481
NSN 5905-01-601-9092
NSN 6145-01-432-0088
NSN 5975-01-328-4685