# Relationship history for MSHA mine 3003709

Current hierarchy: **Dan  Dechiaro; Joseph  Dechiaro → Sand Creek Stone → Extec Portable Screen**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Sand Creek Stone → Extec Portable Screen; 2009-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Dechiaro et al → Extec Portable Screen; 2009-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Dechiaro et al → Sand Creek Stone; 2009-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Dechiaro et al → Sand Creek Stone; 2009-08-25 to current/open; source msha-controller-operator-history