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 5950-00-266-9058
NSN 6610-01-016-9999
NSN 6645-01-005-5915
NSN 5925-01-406-6135
NSN 6145-00-246-9776
NSN 6620-01-428-7072
NSN 5975-01-519-8736
NSN 5965-01-170-9891
NSN 5985-01-338-3665
NSN 6150-01-244-4358
NSN 2925-01-583-5619
NSN 5985-00-978-9945