# Relationship history for MSHA mine 4608620

Current hierarchy: **Aggregate Management, Inc → Fairfax Materials Inc → Ours 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Joseph W  Fint → Ours Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Management, Inc → Ours Quarry; 1989-05-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seneca Sand Inc → Ours Quarry; 1997-01-01 to 1999-12-12; source msha-controller-operator-history
- **controller_controls_operator:** Joseph W  Fint → Seneca Sand Inc; 1997-01-01 to 1999-12-12; source msha-controller-operator-history
- **operator_operates_mine:** Fairfax Materials Inc → Ours Quarry; 1999-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Management, Inc → Fairfax Materials Inc; 1999-12-13 to current/open; source msha-controller-operator-history