# Relationship history for MSHA mine 1503462

Current hierarchy: **Phipps Chester & Hansel Hopkins → H & P Coal Company Inc → No 2 Strip**

- 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:** H & P Coal Company Inc → No 2 Strip; 1950-01-01 to 1983-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Hopkins Bill → No 2 Strip; 1950-01-01 to 1983-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Hopkins Bill → H & P Coal Company Inc; 1950-01-01 to 1983-03-08; source msha-controller-operator-history
- **operator_operates_mine:** H & P Coal Company Inc → No 2 Strip; 1983-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Phipps Chester & Hansel Hopkins → No 2 Strip; 1983-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phipps Chester & Hansel Hopkins → H & P Coal Company Inc; 1983-03-09 to current/open; source msha-controller-operator-history