# Relationship history for MSHA mine 1513879

Current hierarchy: **Mc Gowen Michael & Gary → Stoney Fork Coal Company → 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:** Senters Harold & Clarence Senters Et Al → No 1; 1980-02-01 to 1984-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Rock Bottom Coal Company → No 1; 1983-01-01 to 1984-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Senters Harold & Clarence Senters Et Al → Rock Bottom Coal Company; 1983-01-01 to 1984-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Shevon Coal Inc → No 1; 1984-02-15 to 1985-08-18; source msha-controller-operator-history
- **controller_controls_mine:** Hill Zelma → No 1; 1984-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hill Zelma → Shevon Coal Inc; 1984-02-15 to 1985-08-18; source msha-controller-operator-history
- **operator_operates_mine:** Hardrock Coal Company → No 1; 1985-08-19 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Tyree Charles E Et Al → No 1; 1985-08-19 to 1986-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Tyree Charles E Et Al → Hardrock Coal Company; 1985-08-19 to 1986-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Stoney Fork Coal Company → No 1; 1986-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Gowen Michael & Gary → No 1; 1986-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Gowen Michael & Gary → Stoney Fork Coal Company; 1986-05-12 to current/open; source msha-controller-operator-history