# Relationship history for MSHA mine 3607808

Current hierarchy: **Hall Kenneth L → Final Coal Company → Mine No 1 Final Coal Company**

- 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

- **operator_operates_mine:** Final Coal Company → Mine No 1 Final Coal Company; 1986-06-01 to 1987-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Finocchio Robert & Felix → Mine No 1 Final Coal Company; 1986-06-01 to 1987-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Finocchio Robert & Felix → Final Coal Company; 1986-06-01 to 1987-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Final Coal Company → Mine No 1 Final Coal Company; 1987-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Kenneth L → Mine No 1 Final Coal Company; 1987-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Kenneth L → Final Coal Company; 1987-06-03 to current/open; source msha-controller-operator-history