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 4140-01-468-1798
NSN 5925-00-595-9394
NSN 4140-00-816-7049
NSN 5835-01-229-6964
NSN 5960-01-553-4557
NSN 5910-00-721-2753
NSN 5910-01-646-1648
NSN 5990-00-099-0822
NSN 5855-01-029-8733
NSN 6320-01-334-5305
NSN 6145-01-604-5835
NSN 6685-00-496-2141