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 6320-01-643-0850
NSN 5965-01-029-5070
NSN 6135-00-078-9931
NSN 5990-00-212-4316
NSN 5910-01-641-4373
NSN 5895-01-218-9462
NSN 5985-01-271-6521
NSN 5920-00-351-8428
NSN 5910-00-292-0048
NSN 6135-00-488-4478
NSN 5855-01-284-1609
NSN 5910-00-166-3863