# Relationship history for MSHA mine 4000951

Current hierarchy: **Overton Michael → 33 Quarry → 33 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:** Bill George Quarry → 33 QUARRY; 1950-01-01 to 1979-04-01; source msha-controller-operator-history
- **controller_controls_mine:** George Bill → 33 QUARRY; 1950-01-01 to 1979-04-01; source msha-controller-operator-history
- **controller_controls_operator:** George Bill → Bill George Quarry; 1950-01-01 to 1979-04-01; source msha-controller-operator-history
- **operator_operates_mine:** 33 Quarry → 33 QUARRY; 1979-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Overton Michael → 33 QUARRY; 1979-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Overton Michael → 33 Quarry; 1979-04-02 to current/open; source msha-controller-operator-history