# Relationship history for MSHA mine 0503679

Current hierarchy: **Wolfe George H → George H Wolfe → George Wolfe 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:** Hartley & Sons Inc → George Wolfe Pit; 1981-05-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Hartley & Sons Inc → George Wolfe Pit; 1981-05-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Hartley & Sons Inc → Hartley & Sons Inc; 1981-05-01 to 1984-10-31; source msha-controller-operator-history
- **operator_operates_mine:** George H Wolfe → George Wolfe Pit; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wolfe George H → George Wolfe Pit; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wolfe George H → George H Wolfe; 1984-11-01 to current/open; source msha-controller-operator-history