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 6645-01-436-9702
NSN 5985-01-534-7728
NSN 6645-00-237-8414
NSN 6320-01-177-3192
NSN 5935-01-529-6522
NSN 5975-00-878-9833
NSN 5935-01-410-7435
NSN 5998-00-740-7515
NSN 6130-01-034-7243
NSN 6645-00-171-9639
NSN 5895-00-067-4968
NSN 5998-00-494-0496