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 5925-01-426-6923
NSN 5855-00-586-6255
NSN 6645-00-292-5053
NSN 5950-01-654-0634
NSN 5905-01-158-0284
NSN 5950-00-778-6690
NSN 5990-00-067-6791
NSN 2925-00-103-6822
NSN 5950-00-995-5730
NSN 6135-01-205-5965
NSN 6105-01-044-8956
NSN 5905-01-029-3478