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 5996-00-446-3784
NSN 6135-01-093-7426
NSN 6145-01-135-1294
NSN 5996-01-197-7005
NSN 7035-00-763-6180
NSN 5855-01-318-7663
NSN 5920-01-444-4082
NSN 5920-00-687-1438
NSN 6105-00-578-8114
NSN 6150-00-984-9331
NSN 6220-01-459-8017
NSN 5930-01-542-9895