# Relationship history for MSHA mine 4001581

Current hierarchy: **Premco Petroleum Inc → Premco Coal Inc → Buffalo Creek 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Shattuck Tom N → Buffalo Creek Mine; 1950-01-01 to 1976-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Shattuck Coal Company → Buffalo Creek Mine; 1974-07-01 to 1976-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Shattuck Tom N → Shattuck Coal Company; 1974-07-01 to 1976-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Tenn Rex Mining Company → Buffalo Creek Mine; 1976-08-25 to 1977-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Walden John T → Buffalo Creek Mine; 1976-08-25 to 1977-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Walden John T → Tenn Rex Mining Company; 1976-08-25 to 1977-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Creek Mining Company → Buffalo Creek Mine; 1977-03-15 to 1979-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Blankenship Albert E → Buffalo Creek Mine; 1977-03-15 to 1979-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Albert E → Buffalo Creek Mining Company; 1977-03-15 to 1979-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Premco Coal Inc → Buffalo Creek Mine; 1979-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Premco Petroleum Inc → Buffalo Creek Mine; 1979-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Premco Petroleum Inc → Premco Coal Inc; 1979-01-15 to current/open; source msha-controller-operator-history