# Relationship history for MSHA mine 4201971

Current hierarchy: **Shumway Dan & Glen A → D & G Mining → Blind Luck**

- 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

- **controller_controls_mine:** Shumway Dan & Glen A → Blind Luck; 1985-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & G Mining → Blind Luck; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shumway Dan & Glen A → D & G Mining; 1986-03-01 to current/open; source msha-controller-operator-history