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 4140-00-907-6967
NSN 6105-01-456-3630
NSN 5985-01-138-7451
NSN 5915-00-193-6850
NSN 5965-00-378-3403
NSN 6240-01-206-7882
NSN 6610-00-584-5055
NSN 5965-00-051-6434
NSN 5975-01-198-7178
NSN 6645-00-583-0066
NSN 6130-01-429-0880
NSN 5930-01-330-7023