# Relationship history for MSHA mine 2301539

Current hierarchy: **Gary W  Cullor → Fort Scott Fertilizers Inc → White Rock 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** White Rock Quarries Inc → White Rock Quarry; 1950-01-01 to 1984-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Pohl Joseph L Contractor Inc → White Rock Quarry; 1950-01-01 to 1984-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Pohl Joseph L Contractor Inc → White Rock Quarries Inc; 1950-01-01 to 1984-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Gary W  Cullor → White Rock Quarry; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fort Scott Fertilizers Inc → White Rock Quarry; 1984-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Cullor → Fort Scott Fertilizers Inc; 1984-01-18 to current/open; source msha-controller-operator-history