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 6620-01-212-8089
NSN 6135-00-777-5562
NSN 5905-01-204-8202
NSN 6650-01-168-8451
NSN 5990-01-439-4643
NSN 6145-01-400-0478
NSN 5975-01-392-5233
NSN 5910-00-900-7319
NSN 6320-01-393-7022
NSN 6610-00-471-4260
NSN 5999-00-014-2659
NSN 6650-01-334-7768