# Relationship history for MSHA mine 3610231

Current hierarchy: **Steve P  Caruso → Quarry Management Holdings, LLC → Holbert 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:** Quarry Management Holdings, LLC → Holbert Quarry; 2018-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George V Coyne et al → Holbert Quarry; 2018-03-01 to 2025-07-23; source msha-controller-operator-history
- **controller_controls_operator:** George V Coyne et al → Quarry Management Holdings, LLC; 2018-03-01 to 2025-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Steve P Caruso et al → Quarry Management Holdings, LLC; 2018-03-01 to 2025-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Steve P  Caruso → Holbert Quarry; 2025-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve P  Caruso → Quarry Management Holdings, LLC; 2025-07-24 to current/open; source msha-controller-operator-history