# Relationship history for MSHA mine 1507308

Current hierarchy: **Oakes Freddie → O J Mining Company Inc → No 4 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:** Bowling Mining Company Inc → No 4 Mine; 1974-09-05 to 1975-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Bowling John → No 4 Mine; 1974-09-05 to 1975-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Bowling John → Bowling Mining Company Inc; 1974-09-05 to 1975-05-20; source msha-controller-operator-history
- **operator_operates_mine:** O J Mining Company Inc → No 4 Mine; 1975-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oakes Freddie → No 4 Mine; 1975-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oakes Freddie → O J Mining Company Inc; 1975-05-21 to current/open; source msha-controller-operator-history