# Relationship history for MSHA mine 1503139

Current hierarchy: **Mullins Dale → Mullins & Sons Coal Company Inc → No 1 (D)**

- 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:** Mullins & Sons Coal Company Inc → No 1 (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Dale Et Al → No 1 (D); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Dale Et Al → Mullins & Sons Coal Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history