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 5855-01-433-2220
NSN 6110-01-578-9459
NSN 5835-01-122-2747
NSN 6320-01-067-0474
NSN 5990-01-400-3299
NSN 5895-01-534-3743
NSN 7035-01-068-3300
NSN 6110-01-659-3622
NSN 6220-00-199-3453
NSN 6105-01-068-4366
NSN 5905-01-345-4439
NSN 5996-01-557-5337