# Relationship history for MSHA mine 3603224

Current hierarchy: **Lindy  Ferraro → Eastbrook Sand & Supply → Eastbrook Sand & Supply**

- 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:** Superior Sand & Supply Company → Eastbrook Sand & Supply; 1950-01-01 to 1986-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Audia Michael J → Eastbrook Sand & Supply; 1950-01-01 to 1986-04-14; source msha-controller-operator-history
- **controller_controls_operator:** Audia Michael J → Superior Sand & Supply Company; 1950-01-01 to 1986-04-14; source msha-controller-operator-history
- **operator_operates_mine:** Eastbrook Sand & Supply → Eastbrook Sand & Supply; 1986-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lindy  Ferraro → Eastbrook Sand & Supply; 1986-04-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lindy  Ferraro → Eastbrook Sand & Supply; 1986-04-15 to current/open; source msha-controller-operator-history