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 6240-00-630-8069
NSN 5835-01-029-5602
NSN 5945-00-074-3117
NSN 5950-00-374-8180
NSN 5920-01-370-5521
NSN 6650-01-273-3152
NSN 6645-01-425-2330
NSN 5965-01-143-9577
NSN 6645-01-499-7385
NSN 5960-00-594-0824
NSN 4140-01-634-0330
NSN 5925-00-189-6467