# Relationship history for MSHA mine 3401854

Current hierarchy: **Patrick M  Engel → Engel Sand → GENE AUTRY LOCATION**

- 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:** Patrick M  Engel → GENE AUTRY LOCATION; 1987-03-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Engel Sand → GENE AUTRY LOCATION; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick M  Engel → Engel Sand; 2000-09-01 to current/open; source msha-controller-operator-history