# Relationship history for MSHA mine 3304487

Current hierarchy: **Helmut  Lauff → Artisan Moulded Brick → Richland**

- 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:** Richland Moulded Brick Company → Richland; 2001-10-15 to 2004-06-02; source msha-controller-operator-history
- **controller_controls_mine:** Dudley P  Frame → Richland; 2001-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dudley P  Frame → Richland Moulded Brick Company; 2001-10-15 to 2004-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Artisan Moulded Brick → Richland; 2004-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Helmut  Lauff → Richland; 2004-06-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Helmut  Lauff → Artisan Moulded Brick; 2004-06-03 to current/open; source msha-controller-operator-history