# Relationship history for MSHA mine 2402134

Current hierarchy: **Bertoni Alfonso → I C M Inc → PORTORO QUARRY**

- 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:** I C M Inc → PORTORO QUARRY; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bertoni Alfonso → PORTORO QUARRY; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bertoni Alfonso → I C M Inc; 1998-02-01 to current/open; source msha-controller-operator-history