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 6240-00-840-3647
NSN 6135-00-100-8890
NSN 5945-01-115-4014
NSN 6145-01-212-4359
NSN 5910-01-525-8024
NSN 5999-01-255-3850
NSN 5920-01-212-1536
NSN 5835-01-013-9321
NSN 6130-01-560-3501
NSN 5930-00-583-2999
NSN 6150-01-619-5777
NSN 5925-00-928-8261