# Relationship history for MSHA mine 3003331

Current hierarchy: **Susan R  Hamlin → Hamlin Construction Company Inc → MARK II SERIAL # 2727648**

- 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

- **controller_controls_mine:** Susan R  Hamlin → MARK II SERIAL # 2727648; 1989-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hamlin Construction Company Inc → MARK II SERIAL # 2727648; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susan R  Hamlin → Hamlin Construction Company Inc; 2000-05-01 to current/open; source msha-controller-operator-history