# Relationship history for MSHA mine 4003512

Current hierarchy: **Jimmie R  Ryan → Heat-X-Change, LLC. → Mine # 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

- **controller_controls_mine:** Jimmie R  Ryan et al → Mine # 1; 2016-10-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Heat-X-Change, LLC. → Mine # 1; 2019-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmie R  Ryan et al → Heat-X-Change, LLC.; 2019-02-01 to current/open; source msha-controller-operator-history