# Relationship history for MSHA mine 1515031

Current hierarchy: **Bargo Royal → Rod Coal Company Inc → No 1 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

- **operator_operates_mine:** Rod Coal Company Inc → No 1 Mine; 1985-01-01 to 1985-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Middleton Darrell Et Al → No 1 Mine; 1985-01-01 to 1985-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Darrell Et Al → Rod Coal Company Inc; 1985-01-01 to 1985-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Rod Coal Company Inc → No 1 Mine; 1985-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bargo Royal → No 1 Mine; 1985-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bargo Royal → Rod Coal Company Inc; 1985-05-19 to current/open; source msha-controller-operator-history