# Relationship history for MSHA mine 4609599

Current hierarchy: **Corbin  Robertson III → Quinwood Coal Company, LLC → Quinwood No. 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Corbin  Robertson III → Quinwood No. 1 Deep Mine; 2017-06-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quinwood Coal Company → Quinwood No. 1 Deep Mine; 2020-11-05 to 2021-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Corbin  Robertson III → Quinwood Coal Company; 2020-11-05 to 2021-04-22; source msha-controller-operator-history
- **operator_operates_mine:** JCS Holding Company, LLC → Quinwood No. 1 Deep Mine; 2021-04-23 to 2022-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Jimmie R  Ryan et al → Quinwood No. 1 Deep Mine; 2021-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmie R  Ryan et al → JCS Holding Company, LLC; 2021-04-23 to 2022-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Quinwood Coal Company, LLC → Quinwood No. 1 Deep Mine; 2022-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corbin  Robertson III → Quinwood Coal Company, LLC; 2022-03-07 to current/open; source msha-controller-operator-history