# Relationship history for MSHA mine 3000892

Current hierarchy: **Valente Ludovico → Hurley Sand & Stone Corp → Hurley Sand & Stone Corporation**

- 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:** Hurley Sand & Gravel Company Inc → Hurley Sand & Stone Corporation; 1950-01-01 to 1990-09-10; source msha-controller-operator-history
- **controller_controls_mine:** Schrowang Joseph → Hurley Sand & Stone Corporation; 1950-01-01 to 1990-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Schrowang Joseph → Hurley Sand & Gravel Company Inc; 1950-01-01 to 1990-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Hurley Sand & Stone Corp → Hurley Sand & Stone Corporation; 1990-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Valente Ludovico → Hurley Sand & Stone Corporation; 1990-09-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valente Ludovico → Hurley Sand & Stone Corp; 1990-09-11 to current/open; source msha-controller-operator-history