# Relationship history for MSHA mine 4701551

Current hierarchy: **Tim  Sonnentag → County Materials Corp → Marathon 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** County Concrete Corp → Marathon Wash Plant; 1950-01-01 to 2005-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Sonnentag et al → Marathon Wash Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Concrete Corp; 1950-01-01 to 2005-05-24; source msha-controller-operator-history
- **operator_operates_mine:** County Materials Corp → Marathon Wash Plant; 2005-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tim  Sonnentag et al → Marathon Wash Plant; 2005-05-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tim  Sonnentag et al → County Materials Corp; 2005-05-25 to current/open; source msha-controller-operator-history