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Technician in clean room attire inspecting the Thematic Mapper instrument during pre-launch preparation, showing the scanning aperture and internal components before installation on the Landsat 4 satellite.

Thematic Mapper Clean Room Assembly

Technician in clean room attire inspecting the Thematic Mapper instrument during pre-launch preparation, showing the scanning aperture and internal components before installation on the Landsat 4 satellite.

Image Credit: NASA
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