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 5975-01-377-6365
NSN 5920-01-198-2222
NSN 5920-01-328-9791
NSN 5855-01-108-2044
NSN 6645-00-877-6002
NSN 6685-00-638-9261
NSN 2925-00-724-9252
NSN 6150-01-287-3198
NSN 5905-01-157-9857
NSN 6220-01-290-4739
NSN 5920-01-091-0123
NSN 5985-01-054-3801