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 6135-01-244-5580
NSN 5965-01-431-7377
NSN 5905-01-508-9870
NSN 5935-01-363-8140
NSN 6685-00-244-0019
NSN 5855-00-757-5149
NSN 5990-00-944-3568
NSN 5990-00-937-1089
NSN 6645-00-175-8156
NSN 5915-01-176-7004
NSN 5965-00-170-5254
NSN 6220-01-345-6773