# Relationship history for MSHA mine 1002208

Current hierarchy: **Wade  Olson → O.K. Gravel Works, LLC → Eagle Impactor/Wash 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:** Olson's Excavating → Eagle Impactor/Wash Plant; 2010-07-14 to 2013-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Tobie  Olson → Eagle Impactor/Wash Plant; 2010-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tobie  Olson → Olson's Excavating; 2010-07-14 to 2013-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Wade  Olson → Eagle Impactor/Wash Plant; 2012-07-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** O.K. Gravel Works, LLC → Eagle Impactor/Wash Plant; 2013-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wade  Olson → O.K. Gravel Works, LLC; 2013-04-30 to current/open; source msha-controller-operator-history