# Relationship history for MSHA mine 4602733

Current hierarchy: **Barnhill Robert E Sr → United Coals Inc → Mcwhorter No 1 Strip**

- 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:** United Coals Inc → Mcwhorter No 1 Strip; 1950-01-01 to 1974-11-12; source msha-controller-operator-history
- **controller_controls_mine:** Costelac Lawrence A → Mcwhorter No 1 Strip; 1950-01-01 to 1974-11-12; source msha-controller-operator-history
- **controller_controls_operator:** Costelac Lawrence A → United Coals Inc; 1950-01-01 to 1974-11-12; source msha-controller-operator-history
- **operator_operates_mine:** United Coals Inc → Mcwhorter No 1 Strip; 1974-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barnhill Robert E Sr → Mcwhorter No 1 Strip; 1974-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barnhill Robert E Sr → United Coals Inc; 1974-11-13 to current/open; source msha-controller-operator-history