# Relationship history for MSHA mine 4104367

Current hierarchy: **Robert  Wright; Richard R  Oates → Linn Materials, LLC → McCook South Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Richard R  Oates et al → McCook South Pit; 2000-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Linn Materials, LLC → McCook South Pit; 2002-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard R  Oates et al → Linn Materials, LLC; 2002-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Wright et al → Linn Materials, LLC; 2002-05-21 to current/open; source msha-controller-operator-history