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    LevelDescriptionArchiveDateArchive Number
    LevelItemDescriptionCompany illustration, cross sections of drillArchiveInvestigators' Digital PhotographyDateArchive Number6399790
    LevelItemDescriptionComplete drillArchiveInvestigators' Digital PhotographyDateArchive Number6401460
    LevelItemDescriptionDetail of cutting head and drive unitArchiveInvestigators' Digital PhotographyDateArchive Number6401461
    LevelItemDescriptionDetail of label on drillArchiveInvestigators' Digital PhotographyDateArchive Number6401459