# Relationship history for MSHA mine 1700941

Current hierarchy: **Leonard D Poulin Jr → Len Poulin  Inc. → Ross Hill**

- 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:** Len Poulin  Inc. → Ross Hill; 2014-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leonard D Poulin Jr → Ross Hill; 2014-10-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leonard D Poulin Jr → Len Poulin  Inc.; 2014-10-29 to current/open; source msha-controller-operator-history