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 5920-01-168-7810
NSN 6620-01-337-0652
NSN 6610-01-033-6382
NSN 5935-01-551-1561
NSN 5855-01-406-6261
NSN 6220-00-111-3188
NSN 6220-01-013-9498
NSN 6220-01-248-4452
NSN 6220-01-406-3167
NSN 6220-01-215-2179
NSN 5999-01-076-4692
NSN 6645-01-107-5699