# Relationship history for MSHA mine 4609594

Current hierarchy: **Aggregate Management, Inc → Fairfax Materials Inc. → Metso Screener ST 2.8**

- 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:** Aggregate Management, Inc → Metso Screener ST 2.8; 1989-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fairfax Materials Inc. → Metso Screener ST 2.8; 2020-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Management, Inc → Fairfax Materials Inc.; 2020-06-24 to current/open; source msha-controller-operator-history