# Relationship history for MSHA mine 3503439

Current hierarchy: **Tim  Kerr; Brent  Kerr; Alan  Aplin → Western Rock Resources LLC → Laurelwood 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

- **controller_controls_mine:** Lloyd  Town et al → Laurelwood Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meisel Rock Products → Laurelwood Quarry; 1997-03-01 to 2019-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Lloyd  Town et al → Meisel Rock Products; 1997-03-01 to 2019-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Western Rock Resources LLC → Laurelwood Quarry; 2019-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Kerr et al → Laurelwood Quarry; 2019-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Kerr et al → Western Rock Resources LLC; 2019-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan  Aplin et al → Western Rock Resources LLC; 2019-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Kerr et al → Western Rock Resources LLC; 2019-12-02 to current/open; source msha-controller-operator-history