# Relationship history for MSHA mine 1517466

Current hierarchy: **Parsons Loyall-Dale → W & P Coal Company Inc → #10**

- 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:** Parsons Loyall-Dale Et Al → #10; 1985-09-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W & P Coal Company Inc → #10; 1993-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parsons Loyall-Dale Et Al → W & P Coal Company Inc; 1993-10-01 to current/open; source msha-controller-operator-history