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 6645-01-258-6928
NSN 5925-01-588-0860
NSN 5975-00-835-2213
NSN 5895-00-099-9532
NSN 6105-01-102-8658
NSN 5915-00-761-6890
NSN 6220-01-440-8536
NSN 6645-01-535-7136
NSN 2925-01-600-2309
NSN 5905-00-684-4999
NSN 5910-01-085-5763
NSN 5975-01-091-7527