# Relationship history for MSHA mine 1511218

Current hierarchy: **Coleman Roy Darrell → Tabcol Mining Inc → Tabcol 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:** B & L Coal Company Inc → Tabcol No 1; 1978-04-01 to 1980-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Webb Alvin → Tabcol No 1; 1978-04-01 to 1980-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Webb Alvin → B & L Coal Company Inc; 1978-04-01 to 1980-04-13; source msha-controller-operator-history
- **operator_operates_mine:** George Childers Coal Company Inc → Tabcol No 1; 1980-04-14 to 1980-08-07; source msha-controller-operator-history
- **controller_controls_mine:** Childers George → Tabcol No 1; 1980-04-14 to 1980-08-07; source msha-controller-operator-history
- **controller_controls_operator:** Childers George → George Childers Coal Company Inc; 1980-04-14 to 1980-08-07; source msha-controller-operator-history
- **operator_operates_mine:** T T & T Coal Company → Tabcol No 1; 1980-08-08 to 1984-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Ronnie  Thacker et al → Tabcol No 1; 1980-08-08 to 1984-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie  Thacker et al → T T & T Coal Company; 1980-08-08 to 1984-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Chief Mining Company Inc → Tabcol No 1; 1984-06-18 to 1985-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Bartley Thelma → Tabcol No 1; 1984-06-18 to 1985-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Thelma → Chief Mining Company Inc; 1984-06-18 to 1985-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Trophy Coal Sales Inc → Tabcol No 1; 1985-06-27 to 1986-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Dales Tommy → Tabcol No 1; 1985-06-27 to 1986-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Dales Tommy → Trophy Coal Sales Inc; 1985-06-27 to 1986-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Tabcol Mining Inc → Tabcol No 1; 1986-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Roy Darrell → Tabcol No 1; 1986-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Roy Darrell → Tabcol Mining Inc; 1986-12-15 to current/open; source msha-controller-operator-history