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 5996-01-248-9699
NSN 2925-00-265-7539
NSN 6685-00-079-3307
NSN 5990-01-246-2488
NSN 6150-00-263-3451
NSN 5965-00-170-5254
NSN 5945-01-366-7396
NSN 4140-00-707-5963
NSN 5855-00-221-9435
NSN 5895-01-281-3725
NSN 6645-00-998-7820
NSN 5975-00-099-0045