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 7035-01-082-0311
NSN 5950-01-304-8799
NSN 5920-01-329-1113
NSN 5999-00-420-7735
NSN 5920-00-238-6491
NSN 6240-01-420-5905
NSN 6645-01-534-5545
NSN 5990-01-367-9168
NSN 6320-01-578-6006
NSN 6320-00-024-1004
NSN 6145-01-023-9263
NSN 5945-01-381-1356