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 6645-01-449-8752
NSN 5895-01-523-1778
NSN 5950-01-372-6507
NSN 6685-00-540-8929
NSN 5910-00-740-7286
NSN 5975-01-618-6954
NSN 2925-00-504-2363
NSN 4140-01-322-5182
NSN 5945-00-546-2751
NSN 5895-00-946-6165
NSN 6135-01-629-6940
NSN 5990-01-578-1499