# Relationship history for MSHA mine 2500530

Current hierarchy: **Gillen Frank C → Gillen Sand & Gravel → Frank C Gillen Pit And 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:** Gillen Sand & Gravel → Frank C Gillen Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gillen Frank C → Frank C Gillen Pit And Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gillen Frank C → Gillen Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history