# Relationship history for MSHA mine 1901190

Current hierarchy: **Jerome J  Gagliarducci → Gagliarducci Construction, Inc. → 1144 Nordberg Cone Plant #3351644**

- 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

- **controller_controls_mine:** Jerome J  Gagliarducci et al → 1144 Nordberg Cone Plant #3351644; 2006-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gagliarducci Construction, Inc. → 1144 Nordberg Cone Plant #3351644; 2009-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerome J  Gagliarducci et al → Gagliarducci Construction, Inc.; 2009-07-22 to current/open; source msha-controller-operator-history