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 6145-01-260-3590
NSN 5985-00-964-7692
NSN 5835-01-028-0097
NSN 5990-01-584-8363
NSN 6645-01-615-8359
NSN 5915-01-403-2599
NSN 5915-01-533-5123
NSN 6685-01-566-2082
NSN 6220-01-334-3757
NSN 6320-01-318-6518
NSN 4140-00-125-0837
NSN 5920-01-383-5963