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 6685-00-632-6160
NSN 5855-01-567-4534
NSN 5855-00-189-6066
NSN 5996-00-351-2369
NSN 5925-01-150-8127
NSN 6135-01-511-1975
NSN 5975-00-729-1651
NSN 5990-00-173-9401
NSN 4140-01-421-0667
NSN 6620-01-468-6017
NSN 5935-01-514-5729
NSN 5925-01-578-2137