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 5965-00-823-8623
NSN 4140-01-592-3042
NSN 5855-00-189-6066
NSN 5855-01-054-5243
NSN 5910-01-296-5331
NSN 5910-01-358-8514
NSN 5915-00-915-5733
NSN 6220-01-530-7197
NSN 6645-01-507-7040
NSN 5990-01-029-0868
NSN 6645-01-354-7624
NSN 4140-01-418-1664