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 5835-01-449-7511
NSN 6135-00-994-5021
NSN 6610-01-423-3608
NSN 5985-00-503-5757
NSN 2925-01-459-8093
NSN 6645-01-213-1739
NSN 2925-00-994-8684
NSN 5935-00-519-0281
NSN 6130-01-651-1341
NSN 2925-00-614-1758
NSN 6220-00-501-2867
NSN 7035-00-803-3056