# Relationship history for MSHA mine 2003627

Current hierarchy: **Joseph  Sumbera → Sumbera Excavating, Inc. → Wilkinson Road 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

- **controller_controls_mine:** Joseph  Sumbera → Wilkinson Road Mine; 1999-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sumbera Excavating, Inc. → Wilkinson Road Mine; 2022-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Sumbera → Sumbera Excavating, Inc.; 2022-03-03 to current/open; source msha-controller-operator-history