# Relationship history for MSHA mine 4500727

Current hierarchy: **CRH PLC → Yakima Rock Products Inc → East Selah 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:** Yakima Cement Products Company Inc → East Selah Pit & Plant; 1950-01-01 to 1986-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Martin  Drollinger  et al → East Selah Pit & Plant; 1950-01-01 to 1986-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Martin  Drollinger  et al → Yakima Cement Products Company Inc; 1950-01-01 to 1986-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Yakima Rock Products Inc → East Selah Pit & Plant; 1986-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → East Selah Pit & Plant; 1986-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Yakima Rock Products Inc; 1986-03-12 to current/open; source msha-controller-operator-history