# Relationship history for MSHA mine 3003906

Current hierarchy: **Salvatore  Caruso → Quarry Management Services → The Kent Mine**

- 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 Services → The Kent Mine; 2014-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salvatore  Caruso → The Kent Mine; 2014-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salvatore  Caruso → Quarry Management Services; 2014-04-14 to current/open; source msha-controller-operator-history