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 6135-01-459-6424
NSN 6320-01-170-4068
NSN 5990-00-582-0342
NSN 6320-01-239-7647
NSN 5950-00-161-3044
NSN 6650-01-423-6313
NSN 6645-01-481-5469
NSN 6685-01-249-3248
NSN 5915-01-158-2257
NSN 5915-01-433-4216
NSN 7035-01-323-0164
NSN 6145-01-378-4321