# Relationship history for MSHA mine 1512187

Current hierarchy: **Keener Clifford B → B & S Energy Inc → No 1**

- 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:** Shoe String Coal Corp → No 1; 1979-12-01 to 1980-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Davidson Warren → No 1; 1979-12-01 to 1980-12-10; source msha-controller-operator-history
- **controller_controls_operator:** Davidson Warren → Shoe String Coal Corp; 1979-12-01 to 1980-12-10; source msha-controller-operator-history
- **controller_controls_mine:** Blair John → No 1; 1980-11-18 to 1981-03-04; source msha-controller-operator-history
- **operator_operates_mine:** John Blair Mining Inc → No 1; 1980-12-11 to 1981-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Blair John → John Blair Mining Inc; 1980-12-11 to 1981-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Hatfield Tracy → No 1; 1980-12-29 to 1984-08-30; source msha-controller-operator-history
- **operator_operates_mine:** John Blair Mining Inc → No 1; 1981-03-05 to 1981-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Stevenson Larry → No 1; 1981-03-05 to 1981-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Stevenson Larry → John Blair Mining Inc; 1981-03-05 to 1981-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Buz-Kar Energy Inc → No 1; 1981-08-17 to 1982-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Hatfield Tracy → Buz-Kar Energy Inc; 1981-08-17 to 1982-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Mo-Ash Coal Company Inc → No 1; 1982-10-01 to 1987-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Whitt Bud → No 1; 1982-10-01 to 1987-10-07; source msha-controller-operator-history
- **controller_controls_operator:** Whitt Bud → Mo-Ash Coal Company Inc; 1982-10-01 to 1987-10-07; source msha-controller-operator-history
- **operator_operates_mine:** B & S Energy Inc → No 1; 1987-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Keener Clifford B → No 1; 1987-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keener Clifford B → B & S Energy Inc; 1987-10-08 to current/open; source msha-controller-operator-history