# Relationship history for MSHA mine 3503777

Current hierarchy: **Dorothea D Ellis; Mark  Ellis → Mid Valley Gravel Company → Stonemason Splitter**

- 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:** Barbara  Ellis et al → Stonemason Splitter; 1950-01-01 to 2022-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Mid Valley Gravel Company → Stonemason Splitter; 2012-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Ellis et al → Mid Valley Gravel Company; 2012-03-20 to 2022-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Ellis et al → Stonemason Splitter; 2022-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Ellis et al → Mid Valley Gravel Company; 2022-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dorothea D Ellis et al → Mid Valley Gravel Company; 2022-05-11 to current/open; source msha-controller-operator-history