# Relationship history for MSHA mine 4104797

Current hierarchy: **Robert G McClain; Shawn  Barnes → American Industrial Minerals LLC → American Industrial Minerals LLC**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** American Industrial Minerals LLC → American Industrial Minerals LLC; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert G McClain et al → American Industrial Minerals LLC; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert G McClain et al → American Industrial Minerals LLC; 2009-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shawn  Barnes et al → American Industrial Minerals LLC; 2009-08-31 to current/open; source msha-controller-operator-history