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 5975-00-538-7957
NSN 7035-00-631-3782
NSN 6685-01-292-9772
NSN 6130-01-207-0755
NSN 5905-00-661-2395
NSN 5965-00-617-5731
NSN 5930-01-097-4431
NSN 5985-00-840-4635
NSN 4140-00-516-5002
NSN 7035-00-270-5519
NSN 6645-00-171-9639
NSN 5925-01-288-7136