# Relationship history for MSHA mine 4609405

Current hierarchy: **Corbin  Robertson III → Quinwood Coal Company LLC → Spring Creek Deep Mine**

- 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:** Francis H  McCullough et al → Spring Creek Deep Mine; 2006-11-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Spring Creek Energy Company, LLC → Spring Creek Deep Mine; 2011-03-16 to 2017-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Francis H  McCullough et al → Spring Creek Energy Company, LLC; 2011-03-16 to 2017-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Lewis W  Davis et al → Spring Creek Energy Company, LLC; 2011-03-16 to 2017-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Quinwood Coal Company LLC → Spring Creek Deep Mine; 2017-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Corbin  Robertson III → Spring Creek Deep Mine; 2017-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corbin  Robertson III → Quinwood Coal Company LLC; 2017-06-13 to current/open; source msha-controller-operator-history