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 4140-01-444-7286
NSN 6135-01-113-1507
NSN 5960-00-018-3477
NSN 5895-01-069-3718
NSN 6240-01-126-2980
NSN 6610-01-013-8922
NSN 5965-01-146-6762
NSN 5930-00-254-5316
NSN 5950-00-729-8839
NSN 5905-01-585-6563
NSN 5996-01-457-0335
NSN 5855-01-452-6846