# Relationship history for MSHA mine 2800478

Current hierarchy: **Valente Ludovico → Andover Concrete Industries Inc → Andover Concrete Industries Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Andover Industries Inc → Andover Concrete Industries Incorporated; 1950-01-01 to 1983-02-08; source msha-controller-operator-history
- **controller_controls_mine:** Stoll Jean → Andover Concrete Industries Incorporated; 1950-01-01 to 1983-02-08; source msha-controller-operator-history
- **controller_controls_operator:** Stoll Jean → Andover Industries Inc; 1950-01-01 to 1983-02-08; source msha-controller-operator-history
- **operator_operates_mine:** Andover Concrete Industries Inc → Andover Concrete Industries Incorporated; 1983-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Valente Ludovico → Andover Concrete Industries Incorporated; 1983-02-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Valente Ludovico → Andover Concrete Industries Inc; 1983-02-09 to current/open; source msha-controller-operator-history