# Relationship history for MSHA mine 4103983

Current hierarchy: **McLean Commercial Management LC; McLean Family LTD → Killeen Crushed Stone → Gibbs Quarry**

- 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:** Killeen Crushed Stone → Gibbs Quarry; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** McLean Commercial Management LC et al → Gibbs Quarry; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** McLean Commercial Management LC et al → Killeen Crushed Stone; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** McLean Family LTD et al → Killeen Crushed Stone; 1997-10-01 to current/open; source msha-controller-operator-history