# Relationship history for MSHA mine 2302318

Current hierarchy: **Harlan L Limpus → Quality Aggregates LLC → Quality Aggregates (Hillside Materials)**

- 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:** Team Excavating LLC → Quality Aggregates (Hillside Materials); 2005-07-08 to 2008-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Kevin S  Thomas → Quality Aggregates (Hillside Materials); 2005-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin S  Thomas → Team Excavating LLC; 2005-07-08 to 2008-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Quality Aggregates LLC → Quality Aggregates (Hillside Materials); 2008-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wayne E  Adolphsen et al → Quality Aggregates (Hillside Materials); 2008-12-01 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Wayne E  Adolphsen et al → Quality Aggregates LLC; 2008-12-01 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Harlan L  Limpus et al → Quality Aggregates LLC; 2008-12-01 to 2018-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Harlan L Limpus → Quality Aggregates (Hillside Materials); 2018-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harlan L Limpus → Quality Aggregates LLC; 2018-11-01 to current/open; source msha-controller-operator-history