# Relationship history for MSHA mine 2003275

Current hierarchy: **Charles E  Stringer → Thumb Aggregate Sales LLC → Superior 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:** Thumb Aggregates Inc → Superior Plant; 2003-07-09 to 2016-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Douglas L  Wilson → Superior Plant; 2003-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas L  Wilson → Thumb Aggregates Inc; 2003-07-09 to 2016-07-23; source msha-controller-operator-history
- **operator_operates_mine:** Thumb Aggregate Sales LLC → Superior Plant; 2016-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Stringer → Superior Plant; 2016-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Stringer → Thumb Aggregate Sales LLC; 2016-07-24 to current/open; source msha-controller-operator-history