# Relationship history for MSHA mine 0405324

Current hierarchy: **Erickson Mike & George Kolar → Mesa Minerals → LOHRER**

- 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

- **operator_operates_mine:** Mesa Minerals → LOHRER; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Erickson Mike & George Kolar Et Al → LOHRER; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Erickson Mike & George Kolar Et Al → Mesa Minerals; 1997-08-01 to current/open; source msha-controller-operator-history