# Relationship history for MSHA mine 4201775

Current hierarchy: **Demar  Boren → Demar Boren Contractor → Wagonhound Mine**

- 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

- **controller_controls_mine:** Demar  Boren → Wagonhound Mine; 1978-08-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Demar Boren Contractor → Wagonhound Mine; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Demar  Boren → Demar Boren Contractor; 1982-03-01 to current/open; source msha-controller-operator-history