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 5925-01-020-9501
NSN 6150-00-113-8619
NSN 6610-01-323-0901
NSN 5935-01-391-1786
NSN 5975-01-061-6460
NSN 6240-01-123-8822
NSN 6130-01-609-0664
NSN 5975-01-649-6043
NSN 5905-01-163-9273
NSN 6320-00-882-7061
NSN 5965-00-275-0491
NSN 6320-01-491-0327