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 6135-01-164-3561
NSN 6135-00-715-4001
NSN 6320-01-506-9439
NSN 6645-01-422-5686
NSN 5945-01-297-4165
NSN 5910-01-579-4145
NSN 6145-00-487-9575
NSN 5910-01-388-6385
NSN 7035-01-218-6960
NSN 5910-01-318-4028
NSN 2925-00-945-0792
NSN 2925-01-567-8027