# Relationship history for MSHA mine 1514572

Current hierarchy: **Randy  Johnson → Westerman Coal Company Inc → Sue #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** TECO Energy Inc → Sue #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy  Johnson et al → Sue #1; 1984-02-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tenn-Ky Blue Gem Inc → Sue #1; 1984-04-01 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_mine:** J V  Renfro et al → Sue #1; 1984-04-01 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_operator:** J V  Renfro et al → Tenn-Ky Blue Gem Inc; 1984-04-01 to 1985-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Jarboe James D → Sue #1; 1985-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tenn Ky Blue Gem Inc → Sue #1; 1985-07-10 to 1989-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Jarboe James D → Tenn Ky Blue Gem Inc; 1985-07-10 to 1989-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Gatliff Coal Company Inc → Sue #1; 1989-02-10 to 1989-03-21; source msha-controller-operator-history
- **controller_controls_operator:** TECO Energy Inc → Gatliff Coal Company Inc; 1989-02-10 to 1989-03-21; source msha-controller-operator-history
- **operator_operates_mine:** Westerman Coal Company Inc → Sue #1; 1989-03-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Johnson et al → Westerman Coal Company Inc; 1989-03-22 to current/open; source msha-controller-operator-history