# Relationship history for MSHA mine 1511127

Current hierarchy: **Parsons Loyall-Dale → W & P Coal Company Inc → No 1**

- 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:** Five Brothers Coal Company → No 1; 1978-03-01 to 1985-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Parsons Thomas J Et Al → No 1; 1978-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Thomas J Et Al → Five Brothers Coal Company; 1978-03-01 to 1985-09-11; source msha-controller-operator-history
- **operator_operates_mine:** W & P Coal Company Inc → No 1; 1985-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Parsons Loyall-Dale Et Al → No 1; 1985-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Loyall-Dale Et Al → W & P Coal Company Inc; 1985-09-12 to current/open; source msha-controller-operator-history