# Relationship history for MSHA mine 1510347

Current hierarchy: **Bobby  Thomas → Powell Valley Coal Company 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

- **controller_controls_mine:** Irvan William B & Don Mc Lain → No 1; 1977-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B & D Coal Company → No 1; 1977-04-01 to 1977-05-02; source msha-controller-operator-history
- **controller_controls_operator:** Irvan William B & Don Mc Lain → B & D Coal Company; 1977-04-01 to 1977-05-02; source msha-controller-operator-history
- **operator_operates_mine:** B & D Coal Company → No 1; 1977-05-03 to 1982-10-03; source msha-controller-operator-history
- **controller_controls_mine:** Irvin William B → No 1; 1977-05-03 to 1982-10-03; source msha-controller-operator-history
- **controller_controls_operator:** Irvin William B → B & D Coal Company; 1977-05-03 to 1982-10-03; source msha-controller-operator-history
- **operator_operates_mine:** Old Hickory Log Mining Company Inc → No 1; 1982-10-04 to 1983-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Jones Truman → No 1; 1982-10-04 to 1983-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Jones Truman → Old Hickory Log Mining Company Inc; 1982-10-04 to 1983-01-23; source msha-controller-operator-history
- **operator_operates_mine:** Old Hickory Log Coal Company → No 1; 1983-01-24 to 1984-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Austin Bill & W C Forrester → No 1; 1983-01-24 to 1984-01-05; source msha-controller-operator-history
- **controller_controls_operator:** Austin Bill & W C Forrester → Old Hickory Log Coal Company; 1983-01-24 to 1984-01-05; source msha-controller-operator-history
- **operator_operates_mine:** Powell Valley Coal Company Inc → No 1; 1984-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Thomas → No 1; 1984-01-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Thomas → Powell Valley Coal Company Inc; 1984-01-06 to current/open; source msha-controller-operator-history