# Relationship history for MSHA mine 1512363

Current hierarchy: **Marenko Clifford → Samoyed Mining Company Inc → No 5 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

- **controller_controls_mine:** Curtis  Francis → No 5 Mine; 1971-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marenko Clifford → No 5 Mine; 1978-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Hill Coal Company → No 5 Mine; 1980-06-01 to 1983-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Curtis  Francis → Big Hill Coal Company; 1980-06-01 to 1983-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Samoyed Mining Company Inc → No 5 Mine; 1983-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marenko Clifford → Samoyed Mining Company Inc; 1983-07-21 to current/open; source msha-controller-operator-history