# Relationship history for MSHA mine 4603901

Current hierarchy: **Hawley Charbon → No 10 Coal Mine Inc → Dry Fork 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** No 10 Coal Mining Corp → Dry Fork No 3 Mine; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Belco Petroleum Corp → Dry Fork No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → No 10 Coal Mining Corp; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **operator_operates_mine:** No 10 Coal Mine Inc → Dry Fork No 3 Mine; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Charbon → Dry Fork No 3 Mine; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Charbon → No 10 Coal Mine Inc; 1974-11-01 to current/open; source msha-controller-operator-history