# Relationship history for MSHA mine 1511452

Current hierarchy: **B W  McDonald → Colonial Coal Company Inc → No 15**

- 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:** Leonard F  McCoy → No 15; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Caney Branch Coal Company Inc → No 15; 1978-07-01 to 1980-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Leonard F  McCoy → Caney Branch Coal Company Inc; 1978-07-01 to 1980-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Mc Coy Caney Coal Company → No 15; 1980-10-09 to 1982-07-08; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → No 15; 1980-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Mc Coy Caney Coal Company; 1980-10-09 to 1982-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Anetta Coal Company Inc → No 15; 1982-07-09 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Whitt Amos → No 15; 1982-07-09 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Whitt Amos → Anetta Coal Company Inc; 1982-07-09 to 1983-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Garath Coal Company → No 15; 1983-06-24 to 1983-10-19; source msha-controller-operator-history
- **controller_controls_mine:** Thornbury Garath → No 15; 1983-06-24 to 1983-10-19; source msha-controller-operator-history
- **controller_controls_operator:** Thornbury Garath → Garath Coal Company; 1983-06-24 to 1983-10-19; source msha-controller-operator-history
- **operator_operates_mine:** Mill Branch Coal Company → No 15; 1983-10-20 to 1984-11-08; source msha-controller-operator-history
- **controller_controls_mine:** James B  Simpkins → No 15; 1983-10-20 to 1984-11-08; source msha-controller-operator-history
- **controller_controls_operator:** James B  Simpkins → Mill Branch Coal Company; 1983-10-20 to 1984-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Mc Coy Caney Coal Company → No 15; 1984-11-09 to 1986-11-09; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Mc Coy Caney Coal Company; 1984-11-09 to 1986-11-09; source msha-controller-operator-history
- **operator_operates_mine:** P B Coal Company Inc → No 15; 1986-11-10 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_mine:** James A  Comyns → No 15; 1986-11-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James A  Comyns → P B Coal Company Inc; 1986-11-10 to 1989-02-14; source msha-controller-operator-history
- **controller_controls_mine:** B W  McDonald → No 15; 1988-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colonial Coal Company Inc → No 15; 1989-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  McDonald → Colonial Coal Company Inc; 1989-02-15 to current/open; source msha-controller-operator-history