# Relationship history for MSHA mine 4500585

Current hierarchy: **Heidelberg Materials AG → HM Pacific Northwest, Inc. → Cadman (Redmond)**

- 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:** Cadman Gravel Company → Cadman (Redmond); 1950-01-01 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Paul J  Taylor  et al → Cadman (Redmond); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul J  Taylor  et al → Cadman Gravel Company; 1950-01-01 to 1991-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Jon M  Magnussen  et al → Cadman Gravel Company; 1950-01-01 to 1991-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Cadman Inc → Cadman (Redmond); 1991-01-02 to 2023-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → Cadman (Redmond); 1991-01-02 to 2000-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Cadman Inc; 1991-01-02 to 2000-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Cadman (Redmond); 2000-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Cadman Inc; 2000-07-21 to 2023-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Cadman (Redmond); 2017-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** HM Pacific Northwest, Inc. → Cadman (Redmond); 2023-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → HM Pacific Northwest, Inc.; 2023-01-31 to current/open; source msha-controller-operator-history