# Relationship history for MSHA mine 4403611

Current hierarchy: **Barton Carson Grabern & Chad → J & J Coal Company Inc → No 3**

- 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:** J & J Coal Company Inc → No 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barton Carson Grabern & Chad → No 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barton Carson Grabern & Chad → J & J Coal Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history