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 6240-00-104-4662
NSN 5998-00-541-3468
NSN 5950-00-943-9282
NSN 6320-01-627-8295
NSN 6110-01-577-8369
NSN 5965-01-653-1626
NSN 6610-01-269-5437
NSN 4140-01-477-5472
NSN 5925-01-089-9791
NSN 6645-00-359-5463
NSN 5965-00-454-8706
NSN 5975-01-129-6217