# Relationship history for MSHA mine 0600853

Current hierarchy: **Lauren  Forgione → F&F MATERIALS, LLC → SPLIT ROCK**

- 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

- **operator_operates_mine:** F&F Materials, LLC → SPLIT ROCK; 2025-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lauren  Forgione → SPLIT ROCK; 2025-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lauren  Forgione → F&F Materials, LLC; 2025-04-16 to current/open; source msha-controller-operator-history