# Relationship history for MSHA mine 4801835

Current hierarchy: **Bryce  Fisher → BF Construction, LLC → Robinson Canyon Ranch**

- 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:** BF Construction, LLC → Robinson Canyon Ranch; 2020-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryce  Fisher → Robinson Canyon Ranch; 2020-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryce  Fisher → BF Construction, LLC; 2020-03-25 to current/open; source msha-controller-operator-history