# Relationship history for MSHA mine 4801837

Current hierarchy: **Rhonda  Buchanan; Gordon  Buchanan → Rockin B Ranches, LLC → RB 1**

- 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:** Rockin B Ranches, LLC → RB 1; 2020-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gordon  Buchanan et al → RB 1; 2020-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gordon  Buchanan et al → Rockin B Ranches, LLC; 2020-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhonda  Buchanan et al → Rockin B Ranches, LLC; 2020-07-17 to current/open; source msha-controller-operator-history