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 2925-01-531-1202
NSN 7035-01-477-0501
NSN 6610-00-618-6192
NSN 6650-00-056-1581
NSN 6320-01-233-5798
NSN 6150-01-019-9969
NSN 2925-00-549-6759
NSN 5920-00-099-0737
NSN 6135-00-789-2865
NSN 6105-01-047-4519
NSN 5855-01-461-8169
NSN 5895-00-278-5194