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 5945-01-152-1134
NSN 6130-00-115-9306
NSN 6110-01-602-9353
NSN 5965-01-520-7460
NSN 6150-00-661-0184
NSN 5925-01-145-5330
NSN 6150-00-519-1936
NSN 2925-01-196-6187
NSN 5855-01-158-2709
NSN 5910-00-342-4338
NSN 5990-01-060-3687
NSN 5965-01-109-2917