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Nice trio of iron-on embroidered patches produced by AB Emblem, the official vendor for NASA space program patches. These patches portray the mission emblems designed by their respective space shuttle crews. The quality of AB Emblem patches is much higher than typical souvenir patches one often sees, with quality embroidery that gives the patches a more substantial feel and greater visual appeal. STS (NASA abbreviation for Space Transportation System) missions STS-39 was conducted with Space Shuttle Discovery, STS-40 with Columbia, and STS-41 with Discovery. These missions were launched between late 1990 and mid-1991.