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 5915-01-184-5350
NSN 5930-00-338-0311
NSN 6150-00-915-6790
NSN 5915-00-168-9647
NSN 5965-01-194-3453
NSN 5990-00-140-1159
NSN 5915-01-338-0771
NSN 6135-01-041-3829
NSN 5930-01-658-7218
NSN 5905-01-510-9397
NSN 5925-01-512-9060
NSN 5960-01-422-3269