# Relationship history for MSHA mine 3002519

Current hierarchy: **Paul D  Pass → Eagle Harbor Sand & Gravel Inc → Eagle Harbor Sand & Gravel Inc**

- 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:** Barre Sand Inc → Eagle Harbor Sand & Gravel Inc; 1980-05-01 to 1983-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  O'Connor → Eagle Harbor Sand & Gravel Inc; 1980-05-01 to 1983-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  O'Connor → Barre Sand Inc; 1980-05-01 to 1983-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Carter Sand & Gravel Inc → Eagle Harbor Sand & Gravel Inc; 1983-07-29 to 2005-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Carter → Eagle Harbor Sand & Gravel Inc; 1983-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Carter → Carter Sand & Gravel Inc; 1983-07-29 to 2005-05-18; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Harbor Sand & Gravel Inc → Eagle Harbor Sand & Gravel Inc; 2005-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Paul D  Pass → Eagle Harbor Sand & Gravel Inc; 2005-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul D  Pass → Eagle Harbor Sand & Gravel Inc; 2005-05-19 to current/open; source msha-controller-operator-history