# Relationship history for MSHA mine 1506399

Current hierarchy: **Keathley Joe R → Phyllis Coal Company Inc → No 1 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:** B & H Coal Company → No 1 Tipple; 1950-01-01 to 1974-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Collins Hoover & Buddy Sexton → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Collins Hoover & Buddy Sexton → B & H Coal Company; 1950-01-01 to 1974-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Keathley Joe R → No 1 Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Phyllis Coal Company Inc → No 1 Tipple; 1974-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keathley Joe R → Phyllis Coal Company Inc; 1974-06-10 to current/open; source msha-controller-operator-history