# Relationship history for MSHA mine 4406827

Current hierarchy: **Blevins A C → Black Falcon Enterprise Inc → #2 Auger**

- 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:** Blevins A C → #2 Auger; 1994-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Falcon Enterprise Inc → #2 Auger; 1996-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blevins A C → Black Falcon Enterprise Inc; 1996-03-01 to current/open; source msha-controller-operator-history