# Relationship history for MSHA mine 4602530

Current hierarchy: **Aggregate Management, Inc → Fairfax Materials Inc → Thomas 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

- **operator_operates_mine:** Fairfax Sand & Crushed Stone Company → Thomas Quarry; 1950-01-01 to 1989-05-02; source msha-controller-operator-history
- **controller_controls_mine:** Gay C  Roth → Thomas Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gay C  Roth → Fairfax Sand & Crushed Stone Company; 1950-01-01 to 1989-05-02; source msha-controller-operator-history
- **operator_operates_mine:** Fairfax Materials Inc → Thomas Quarry; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Management, Inc → Thomas Quarry; 1989-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Management, Inc → Fairfax Materials Inc; 1989-05-03 to current/open; source msha-controller-operator-history