# Relationship history for MSHA mine 3800689

Current hierarchy: **Asea Brown Boveri Ltd (ABB) → Dry Branch Kaolin Company → CUMINGS**

- 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:** Asea Brown Boveri Ltd (ABB) → CUMINGS; 1980-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dry Branch Kaolin Company → CUMINGS; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asea Brown Boveri Ltd (ABB) → Dry Branch Kaolin Company; 1999-06-01 to current/open; source msha-controller-operator-history