# Relationship history for MSHA mine 2500153

Current hierarchy: **Jerome  Cyza; Ronald  Cyza → Cyza Brothers Sand & Gravel Company → CYZA BROTHERS 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:** Cyza Brothers Sand & Gravel Company → CYZA BROTHERS PIT AND PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jerome  Cyza  et al → CYZA BROTHERS PIT AND PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome  Cyza  et al → Cyza Brothers Sand & Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald  Cyza  et al → Cyza Brothers Sand & Gravel Company; 1950-01-01 to current/open; source msha-controller-operator-history