# Relationship history for MSHA mine 3503939

Current hierarchy: **Nathanial L Becker → Pulguero Rock and Stone Co, LLC → Pulguero**

- 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:** Pulguero Rock and Stone Co, LLC → Pulguero; 2022-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nathanial L Becker → Pulguero; 2022-12-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nathanial L Becker → Pulguero Rock and Stone Co, LLC; 2022-12-07 to current/open; source msha-controller-operator-history