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 5998-00-619-1663
NSN 6650-00-710-8130
NSN 5965-01-280-3772
NSN 6105-00-248-5772
NSN 5950-01-378-8387
NSN 6320-01-379-1182
NSN 5960-01-139-0293
NSN 6610-00-844-1195
NSN 5975-00-251-2478
NSN 5895-01-482-4374
NSN 5998-00-226-3081
NSN 5990-01-114-5095