# Relationship history for MSHA mine 4000368

Current hierarchy: **Byers Bill & Clint Oliver → Bill Byers & Clint Oliver → 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:** Hunziker Coal Company → No 1; 1950-01-01 to 1975-04-01; source msha-controller-operator-history
- **controller_controls_mine:** Hunziker Coal Company → No 1; 1950-01-01 to 1975-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Hunziker Coal Company → Hunziker Coal Company; 1950-01-01 to 1975-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Partin Coal Company Inc → No 1; 1975-04-02 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Partin Richard L → No 1; 1975-04-02 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Partin Richard L → Partin Coal Company Inc; 1975-04-02 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Bill Byers & Clint Oliver → No 1; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Byers Bill & Clint Oliver → No 1; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Byers Bill & Clint Oliver → Bill Byers & Clint Oliver; 1979-11-01 to current/open; source msha-controller-operator-history