# Relationship history for MSHA mine 4502295

Current hierarchy: **Luke L  Hughes → Cascade Concrete Products Co Inc → Winthrop 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Cascade Concrete Products Inc → Winthrop Pit & Plant; 1950-01-01 to 1993-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Walter L  Foster → Winthrop Pit & Plant; 1950-01-01 to 1993-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Walter L  Foster → Cascade Concrete Products Inc; 1950-01-01 to 1993-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Cascade Concrete Products Co Inc → Winthrop Pit & Plant; 1993-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Karen R  Patterson → Winthrop Pit & Plant; 1993-02-09 to 2016-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Karen R  Patterson → Cascade Concrete Products Co Inc; 1993-02-09 to 2016-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Chad L  Patterson → Winthrop Pit & Plant; 2016-03-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Chad L  Patterson → Cascade Concrete Products Co Inc; 2016-03-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Luke L  Hughes → Winthrop Pit & Plant; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luke L  Hughes → Cascade Concrete Products Co Inc; 2022-01-01 to current/open; source msha-controller-operator-history