# Relationship history for MSHA mine 4405674

Current hierarchy: **Matney Dickie → D & M Coal Company → No 2 Auger 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

- **operator_operates_mine:** D & M Coal Company → No 2 Auger Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matney Dickie → No 2 Auger Mine; 1981-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matney Dickie → D & M Coal Company; 1981-06-01 to current/open; source msha-controller-operator-history