# Relationship history for MSHA mine 3003833

Current hierarchy: **Michael  Austin → Austin Construction LLC → Metso ST272**

- 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:** Michael  Austin → Metso ST272; 1996-03-25 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Austin Construction LLC → Metso ST272; 2012-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Austin → Austin Construction LLC; 2012-03-12 to current/open; source msha-controller-operator-history