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 6650-01-386-5787
NSN 6110-00-007-5283
NSN 5910-00-439-0655
NSN 6240-01-568-1070
NSN 6135-00-767-0331
NSN 5905-00-827-0728
NSN 6645-00-640-9870
NSN 5915-00-232-3387
NSN 5925-00-148-8241
NSN 6240-01-511-3754
NSN 7035-00-275-5604
NSN 4140-01-171-7013