# Relationship history for MSHA mine 0503989

Current hierarchy: **Cullen John → John Cullen Rock Crushing → Buffalo 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:** John Cullen Rock Crushing → Buffalo Pit; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cullen John → Buffalo Pit; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cullen John → John Cullen Rock Crushing; 1984-08-01 to current/open; source msha-controller-operator-history