# Relationship history for MSHA mine 1502940

Current hierarchy: **Bill R  Wallace; Goebel  Zeller → Faith Coal Sales Inc → No 5 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

- **controller_controls_mine:** Thacker Ballard → No 5 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Grace Coal Company → No 5 Mine; 1950-01-01 to 1974-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Grace Coal Company → No 5 Mine; 1950-01-01 to 1974-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Grace Coal Company → Grace Coal Company; 1950-01-01 to 1974-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Thacker Coal Company → No 5 Mine; 1974-01-24 to 1978-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Thacker Ballard → Thacker Coal Company; 1974-01-24 to 1978-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Bill R  Wallace et al → No 5 Mine; 1974-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Childers George → No 5 Mine; 1977-09-01 to 1980-05-19; source msha-controller-operator-history
- **operator_operates_mine:** G C Coal Company → No 5 Mine; 1978-10-03 to 1980-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Childers George → G C Coal Company; 1978-10-03 to 1980-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Faith Coal Sales Inc → No 5 Mine; 1980-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill R  Wallace et al → Faith Coal Sales Inc; 1980-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Goebel  Zeller et al → Faith Coal Sales Inc; 1980-05-20 to current/open; source msha-controller-operator-history