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 6145-01-064-6872
NSN 6320-01-036-2598
NSN 2925-01-412-9520
NSN 5920-00-170-9081
NSN 5990-01-215-0590
NSN 5905-00-357-1579
NSN 5935-00-776-3119
NSN 5965-01-104-5102
NSN 6685-01-145-2478
NSN 5935-01-352-0723
NSN 5915-01-389-6081
NSN 6645-00-891-7392