# Relationship history for MSHA mine 4000230

Current hierarchy: **Bunch Jo Anne → Laurel Fork Mining Company Inc → No 3 Mine**

- 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:** Phillips Coal Company Inc → No 3 Mine; 1970-01-02 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Phillips Earl → No 3 Mine; 1970-01-02 to 1973-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Phillips Earl → Phillips Coal Company Inc; 1970-01-02 to 1973-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Fork Mining Company Inc → No 3 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bunch Jo Anne → No 3 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bunch Jo Anne → Laurel Fork Mining Company Inc; 1974-01-01 to current/open; source msha-controller-operator-history