# Relationship history for MSHA mine 0100341

Current hierarchy: **Russell Vester H → Russell Coal Inc → Bankhead Mine**

- 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:** Bankhead Mining Company Inc → Bankhead Mine; 1950-01-01 to 1978-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Cobb W F Jr Et Al → Bankhead Mine; 1950-01-01 to 1978-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Cobb W F Jr Et Al → Bankhead Mining Company Inc; 1950-01-01 to 1978-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Russell Vester H → Bankhead Mine; 1974-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bankhead Mining Company Inc → Bankhead Mine; 1978-10-01 to 1985-12-19; source msha-controller-operator-history
- **controller_controls_mine:** MidAmerican Energy Holdings Company → Bankhead Mine; 1978-10-01 to 1985-12-19; source msha-controller-operator-history
- **controller_controls_operator:** MidAmerican Energy Holdings Company → Bankhead Mining Company Inc; 1978-10-01 to 1985-12-19; source msha-controller-operator-history
- **operator_operates_mine:** Russell Coal Inc → Bankhead Mine; 1985-12-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell Vester H → Russell Coal Inc; 1985-12-20 to current/open; source msha-controller-operator-history