# Relationship history for MSHA mine 2501052

Current hierarchy: **Larry  Dolezal → Dolezal Sand & Gravel → DOLEZAL 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Dolezal Sand & Gravel → DOLEZAL SAND & GRAVEL; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Dolezal → DOLEZAL SAND & GRAVEL; 1985-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Dolezal → Dolezal Sand & Gravel; 1985-10-01 to current/open; source msha-controller-operator-history