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 6220-01-125-5131
NSN 5998-01-469-1423
NSN 5930-00-332-1528
NSN 5965-01-408-3558
NSN 6150-01-501-1717
NSN 6645-01-398-6841
NSN 5945-01-656-5877
NSN 5905-01-651-5060
NSN 5945-01-025-1163
NSN 6645-01-354-5589
NSN 6135-00-553-7995
NSN 6135-00-738-5571