# Relationship history for MSHA mine 1102385

Current hierarchy: **Ervin Greg → Ervin Sand & Gravel → Ervin Sand & Gravel**

- 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:** Greenup Sand & Gravel → Ervin Sand & Gravel; 1950-01-01 to 1984-02-14; source msha-controller-operator-history
- **controller_controls_mine:** Cummins Larry & Carl-Karl Probst → Ervin Sand & Gravel; 1950-01-01 to 1984-02-14; source msha-controller-operator-history
- **controller_controls_operator:** Cummins Larry & Carl-Karl Probst → Greenup Sand & Gravel; 1950-01-01 to 1984-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Ervin Sand & Gravel → Ervin Sand & Gravel; 1984-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ervin Greg → Ervin Sand & Gravel; 1984-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ervin Greg → Ervin Sand & Gravel; 1984-02-15 to current/open; source msha-controller-operator-history