# Relationship history for MSHA mine 1511305

Current hierarchy: **Roop Ralph → Walnut Creek Coal Company → Hi-Hat No 3 Tipple**

- 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:** Hamilton & Warfield Coal Company → Hi-Hat No 3 Tipple; 1978-04-01 to 1980-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Sterling & Hollie Conley → Hi-Hat No 3 Tipple; 1978-04-01 to 1980-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Sterling & Hollie Conley → Hamilton & Warfield Coal Company; 1978-04-01 to 1980-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Walnut Creek Coal Company → Hi-Hat No 3 Tipple; 1980-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Roop Ralph → Hi-Hat No 3 Tipple; 1980-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roop Ralph → Walnut Creek Coal Company; 1980-05-28 to current/open; source msha-controller-operator-history