# Relationship history for MSHA mine 4501688

Current hierarchy: **James  Hutchinson → Ellensburg Cement Products Inc → Mattiesen Quarry**

- 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:** James O  Hutchinson  et al → Mattiesen Quarry; 1950-01-01 to 2023-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Douglas County Road Department → Mattiesen Quarry; 1950-01-01 to 1980-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Douglas County-Wa → Mattiesen Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas County-Wa → Douglas County Road Department; 1950-01-01 to 1980-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Ellensburg Cement Products Inc → Mattiesen Quarry; 1980-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James O  Hutchinson  et al → Ellensburg Cement Products Inc; 1980-01-17 to 2023-07-30; source msha-controller-operator-history
- **controller_controls_mine:** James  Hutchinson → Mattiesen Quarry; 2023-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Hutchinson → Ellensburg Cement Products Inc; 2023-07-31 to current/open; source msha-controller-operator-history