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 6685-01-109-8769
NSN 5990-01-064-7157
NSN 6320-01-411-7469
NSN 5920-01-462-1950
NSN 5945-00-420-5712
NSN 6620-01-564-9870
NSN 5895-00-790-9249
NSN 5965-00-044-6554
NSN 5950-01-040-8094
NSN 5895-01-439-2224
NSN 6105-00-486-3875
NSN 6145-01-627-8517