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 5960-01-168-5010
NSN 4140-01-317-1172
NSN 5855-01-138-4985
NSN 5930-01-148-9200
NSN 6650-01-384-1657
NSN 6685-01-441-9275
NSN 5950-01-095-7442
NSN 6645-01-620-4837
NSN 5998-01-245-4236
NSN 5935-01-460-6965
NSN 6145-00-269-3524
NSN 6685-00-311-5700