# Relationship history for MSHA mine 0500967

Current hierarchy: **CRH PLC → Oldcastle SW Group, Inc. → SP1**

- 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:** Delta Sand & Gravel Company → SP1; 1950-01-01 to 1998-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Thelma B  Starner → SP1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thelma B  Starner → Delta Sand & Gravel Company; 1950-01-01 to 1998-03-31; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → SP1; 1998-01-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oldcastle SW Group, Inc. → SP1; 1998-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Oldcastle SW Group, Inc.; 1998-04-01 to current/open; source msha-controller-operator-history