# Relationship history for MSHA mine 3609037

Current hierarchy: **Matthew  Cruver → Cruver Flagstone Prod. → Dzuiba 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:** T.A.G. Quarries → Dzuiba Quarry; 2001-09-27 to 2002-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Todd A  Gleason → Dzuiba Quarry; 2001-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd A  Gleason → T.A.G. Quarries; 2001-09-27 to 2002-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Cruver Flagstone Prod. → Dzuiba Quarry; 2002-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Cruver → Dzuiba Quarry; 2002-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Cruver → Cruver Flagstone Prod.; 2002-06-05 to current/open; source msha-controller-operator-history