# Relationship history for MSHA mine 3500793

Current hierarchy: **Ed  Stratton → Umpqua Excavation & Paving → DAN PARKER PIT**

- 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:** Dan Parker Crushing → DAN PARKER PIT; 1950-01-01 to 1994-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Parker → DAN PARKER PIT; 1950-01-01 to 1994-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Parker → Dan Parker Crushing; 1950-01-01 to 1994-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Umpqua Excavation & Paving → DAN PARKER PIT; 1994-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ed  Stratton → DAN PARKER PIT; 1994-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ed  Stratton → Umpqua Excavation & Paving; 1994-09-26 to current/open; source msha-controller-operator-history