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 5910-01-347-6385
NSN 5998-01-455-8258
NSN 5855-01-348-6690
NSN 5960-01-487-6436
NSN 5975-01-414-7816
NSN 6220-01-248-1927
NSN 5855-01-378-1888
NSN 6145-01-226-6792
NSN 6685-01-384-2844
NSN 6320-01-320-3305
NSN 5920-01-633-3751
NSN 6650-00-078-5773