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 6685-00-103-2854
NSN 6110-01-287-8438
NSN 5998-01-235-5331
NSN 6685-01-230-1412
NSN 6110-01-565-3433
NSN 5935-00-535-4213
NSN 5925-01-511-5852
NSN 6685-01-628-6086
NSN 5835-01-329-4814
NSN 6685-01-359-8716
NSN 6645-00-392-8728
NSN 6620-01-169-2406