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 5905-01-356-4078
NSN 6110-01-483-0639
NSN 6135-01-458-7476
NSN 6685-00-786-2121
NSN 6645-00-842-4653
NSN 5925-01-361-1775
NSN 5855-00-198-3197
NSN 5910-01-473-4384
NSN 5855-00-237-4088
NSN 5925-01-202-6171
NSN 6645-01-322-8431
NSN 5855-01-398-9548