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 2925-01-085-0691
NSN 5905-00-497-5686
NSN 5835-01-583-0453
NSN 6220-00-772-9791
NSN 5990-01-652-7373
NSN 6645-00-057-3499
NSN 5935-00-808-0618
NSN 6650-00-555-1061
NSN 6610-00-567-9385
NSN 5920-01-117-5053
NSN 5930-01-087-9313
NSN 6685-01-484-1263