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 5975-01-528-7886
NSN 6240-01-415-3014
NSN 6645-01-449-1452
NSN 5950-01-398-3531
NSN 6135-00-900-2139
NSN 5835-01-383-1313
NSN 6220-00-299-7749
NSN 5998-01-371-2844
NSN 5835-01-373-3498
NSN 5999-01-346-8414
NSN 5975-00-153-7971
NSN 6130-01-377-0370