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 5925-01-194-7790
NSN 6685-01-603-0844
NSN 6685-01-240-0087
NSN 5945-00-284-7312
NSN 5935-00-232-4042
NSN 6220-00-279-1508
NSN 5905-00-832-9003
NSN 6685-01-411-6579
NSN 6145-00-360-7760
NSN 6105-01-509-1672
NSN 5960-00-227-0243
NSN 5999-01-023-8776