# Relationship history for MSHA mine 1302461

Current hierarchy: **Koch Industries Inc → Georgia-Pacific Gypsum LLC → G-P Fort Dodge Quarry**

- 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

- **controller_controls_mine:** Koch Industries Inc → G-P Fort Dodge Quarry; 2006-12-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Georgia-Pacific Gypsum LLC → G-P Fort Dodge Quarry; 2017-03-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koch Industries Inc → Georgia-Pacific Gypsum LLC; 2017-03-16 to current/open; source msha-controller-operator-history