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 6610-01-224-7247
NSN 5925-01-023-1411
NSN 5910-01-231-4476
NSN 6110-01-545-3465
NSN 5895-00-542-2019
NSN 7035-01-584-7232
NSN 5960-00-617-9312
NSN 6150-01-605-0531
NSN 5935-00-657-1527
NSN 6685-01-606-5739
NSN 6645-00-573-0572
NSN 5950-01-467-1765