# Relationship history for MSHA mine 4500609

Current hierarchy: **Heidelberg Materials AG → HM Pacific Northwest Inc. → Enumclaw Pit & 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:** Tim Corliss & Son Inc → Enumclaw Pit & Plant; 1950-01-01 to 2002-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Scott D  Corliss et al → Enumclaw Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott D  Corliss et al → Tim Corliss & Son Inc; 1950-01-01 to 2002-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Corliss Resources LLC → Enumclaw Pit & Plant; 2003-01-01 to 2026-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Scott D  Corliss et al → Enumclaw Pit & Plant; 2003-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Scott D  Corliss et al → Corliss Resources LLC; 2003-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Enumclaw Pit & Plant; 2017-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Enumclaw Pit & Plant; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Corliss Resources LLC; 2022-01-01 to 2026-03-22; source msha-controller-operator-history
- **operator_operates_mine:** HM Pacific Northwest Inc. → Enumclaw Pit & Plant; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → HM Pacific Northwest Inc.; 2026-03-23 to current/open; source msha-controller-operator-history