# Relationship history for MSHA mine 4608854

Current hierarchy: **DTE Energy Company → DTE Smith Branch LLC → Smith Branch Plant**

- 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:** Dte Smith Branch Llc → Smith Branch Plant; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** DTE Energy Company → Smith Branch Plant; 2000-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DTE Energy Company → Dte Smith Branch Llc; 2000-09-01 to current/open; source msha-controller-operator-history