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 6220-00-838-2231
NSN 5960-00-227-0243
NSN 5998-01-428-2982
NSN 6135-01-069-2482
NSN 4140-01-327-5402
NSN 6650-00-187-5388
NSN 5930-01-525-4891
NSN 5855-01-010-4921
NSN 6150-01-238-5738
NSN 6685-01-179-3099
NSN 7035-01-560-7430
NSN 2925-01-078-5702