# Relationship history for MSHA mine 3901182

Current hierarchy: **Burleson Dale & Daniel → D & D Mining → Happy Jack**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** D & D Mining → Happy Jack; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burleson Dale & Daniel → Happy Jack; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burleson Dale & Daniel → D & D Mining; 1979-01-01 to current/open; source msha-controller-operator-history