# Relationship history for MSHA mine 3609082

Current hierarchy: **Edward J  Signor; Robert A  Signor → Signor Brothers Contracting → Berguson**

- 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:** Signor Brothers Contracting → Berguson; 2002-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward J  Signor et al → Berguson; 2002-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Signor et al → Signor Brothers Contracting; 2002-05-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Signor et al → Signor Brothers Contracting; 2002-05-06 to current/open; source msha-controller-operator-history