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 5915-00-887-8999
NSN 6150-01-367-7427
NSN 6645-00-176-5589
NSN 5920-01-370-9709
NSN 5855-01-532-1751
NSN 6645-01-168-8465
NSN 6145-01-608-2904
NSN 6220-00-482-6916
NSN 6110-00-185-2021
NSN 5945-01-212-2691
NSN 6685-01-657-6351
NSN 5835-00-978-4473