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 5910-01-036-0901
NSN 5910-01-082-5335
NSN 6610-00-905-6780
NSN 5985-00-009-2798
NSN 5910-01-353-0004
NSN 5910-01-168-8008
NSN 6685-01-066-2901
NSN 6645-01-039-4259
NSN 7035-01-413-6697
NSN 6650-00-180-5184
NSN 6130-01-235-0648
NSN 6110-00-551-8321