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 6130-01-581-4078
NSN 5920-00-155-2173
NSN 6650-00-073-6542
NSN 5965-01-204-8505
NSN 5945-01-521-5849
NSN 7035-01-448-4740
NSN 6320-00-299-3090
NSN 6650-01-423-6313
NSN 6135-01-619-4423
NSN 5910-00-020-8032
NSN 7035-01-541-8029
NSN 6685-01-347-8658