# Relationship history for MSHA mine 4407225

Current hierarchy: **Metinvest B V → Surface Minerals Company → Huffman Fk.**

- 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:** Kenneth L  Stacy → Huffman Fk.; 2001-08-01 to 2006-02-09; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Huffman Fk.; 2006-02-10 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Surface Minerals Company → Huffman Fk.; 2008-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Surface Minerals Company; 2008-04-23 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Stacy → Surface Minerals Company; 2008-04-23 to 2006-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Huffman Fk.; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Surface Minerals Company; 2009-04-30 to current/open; source msha-controller-operator-history