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 6620-01-478-2485
NSN 6645-01-651-2743
NSN 5985-01-557-9650
NSN 6105-00-111-2546
NSN 5915-01-561-4967
NSN 6220-01-212-9016
NSN 2925-01-464-3093
NSN 6610-01-400-3880
NSN 7035-01-213-5590
NSN 6220-01-245-0310
NSN 6650-00-103-3239
NSN 5950-01-538-5128