# Relationship history for MSHA mine 3002707

Current hierarchy: **Hakes George J Jr → Hakes Construction Company Inc → Janowski Pit**

- 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:** R L Callahan Inc → Janowski Pit; 1985-09-01 to 1987-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Callahan → Janowski Pit; 1985-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Callahan → R L Callahan Inc; 1985-09-01 to 1987-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Hakes George J Jr → Janowski Pit; 1987-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hakes Construction Company Inc → Janowski Pit; 1987-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hakes George J Jr → Hakes Construction Company Inc; 1987-08-11 to current/open; source msha-controller-operator-history