# Relationship history for MSHA mine 4608032

Current hierarchy: **Everett E  Ballard Jr → Ballard Brothers Coal Inc → Buffalo 10-A**

- 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:** Ballard Brothers Coal Inc → Buffalo 10-A; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Everett E  Ballard Jr → Buffalo 10-A; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everett E  Ballard Jr → Ballard Brothers Coal Inc; 1991-05-01 to current/open; source msha-controller-operator-history