# Relationship history for MSHA mine 0600536

Current hierarchy: **Aaron  Ansaldi; Alex  Ansaldi → ANDREW ANSALDI COMPANY → ANDREW ANSALDI COMPANY**

- 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:** Andrew Ansaldi Company → ANDREW ANSALDI COMPANY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Andrew  Ansaldi → ANDREW ANSALDI COMPANY; 1950-01-01 to 2025-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Ansaldi → Andrew Ansaldi Company; 1950-01-01 to 2025-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Aaron  Ansaldi et al → ANDREW ANSALDI COMPANY; 2025-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron  Ansaldi et al → Andrew Ansaldi Company; 2025-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alex  Ansaldi et al → Andrew Ansaldi Company; 2025-08-04 to current/open; source msha-controller-operator-history