# Relationship history for MSHA mine 0503007

Current hierarchy: **CRH PLC → Oldcastle SW Group, Inc → Ralston 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Asphalt Paving Company → Ralston Quarry; 1950-01-01 to 2021-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey W  Keller  et al → Ralston Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey W  Keller  et al → Asphalt Paving Company; 1950-01-01 to 2021-07-26; source msha-controller-operator-history
- **controller_controls_operator:** John M  Keller  et al → Asphalt Paving Company; 1950-01-01 to 2021-07-26; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Ralston Quarry; 1998-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group, Inc → Ralston Quarry; 2021-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group, Inc; 2021-07-27 to current/open; source msha-controller-operator-history