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 5950-01-103-5819
NSN 5985-01-454-6627
NSN 6320-00-284-1524
NSN 6685-01-363-9688
NSN 6685-01-342-2076
NSN 5910-00-171-3414
NSN 5990-01-434-7913
NSN 5985-01-020-7203
NSN 5835-01-116-2369
NSN 5915-01-029-4128
NSN 6150-01-003-8940
NSN 5999-01-281-8366