# Relationship history for MSHA mine 1901210

Current hierarchy: **Jerome J  Gagliarducci → GAGLIARDUCCI CONSTRUCTION INC. → LT 200 HP S/N 73424**

- 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

- **controller_controls_mine:** Jerome J  Gagliarducci et al → LT 200 HP S/N 73424; 2006-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gagliarducci Construction Inc. → LT 200 HP S/N 73424; 2011-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome J  Gagliarducci et al → Gagliarducci Construction Inc.; 2011-06-28 to current/open; source msha-controller-operator-history