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 5925-00-966-5836
NSN 5998-01-213-1379
NSN 6685-01-119-1579
NSN 5855-01-353-3958
NSN 5835-01-470-3337
NSN 6145-01-409-1685
NSN 6610-00-166-7406
NSN 5950-01-220-7309
NSN 6150-00-432-5668
NSN 6150-01-054-3526
NSN 6130-00-906-2514
NSN 5990-01-084-0807