# Relationship history for MSHA mine 4503548

Current hierarchy: **Heidelberg Materials AG → HM Pacific Northwest Inc. → Cascade 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Taiheiyo Cement Corp → Cascade Quarry; 1990-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miller Quarry LLC → Cascade Quarry; 2003-06-30 to 2006-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Scott  A  Miller et al → Cascade Quarry; 2003-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  A  Miller et al → Miller Quarry LLC; 2003-06-30 to 2006-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Jack C  Miller et al → Miller Quarry LLC; 2003-06-30 to 2006-09-18; source msha-controller-operator-history
- **operator_operates_mine:** RLF Miller Quarry LLC → Cascade Quarry; 2006-09-19 to 2015-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Aaron M  Patsch → Cascade Quarry; 2006-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron M  Patsch → RLF Miller Quarry LLC; 2006-09-19 to 2015-06-30; source msha-controller-operator-history
- **operator_operates_mine:** CPC Materials, Inc. → Cascade Quarry; 2015-07-01 to 2017-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Taiheiyo Cement Corp → Cascade Quarry; 2015-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → CPC Materials, Inc.; 2015-07-01 to 2017-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Cascade Quarry; 2017-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CalPortland Company → Cascade Quarry; 2017-11-01 to 2025-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Taiheiyo Cement Corp → CalPortland Company; 2017-11-01 to 2025-11-03; source msha-controller-operator-history
- **operator_operates_mine:** HM Pacific Northwest Inc. → Cascade Quarry; 2025-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → HM Pacific Northwest Inc.; 2025-11-04 to current/open; source msha-controller-operator-history