# Relationship history for MSHA mine 4300807

Current hierarchy: **Jacob D  Simpson → Simpson Dirtworx llc → McCloskey Model R105 SN: 80837**

- 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:** Jacob D  Simpson → McCloskey Model R105 SN: 80837; 2013-06-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Simpson Dirtworx llc → McCloskey Model R105 SN: 80837; 2021-08-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacob D  Simpson → Simpson Dirtworx llc; 2021-08-19 to current/open; source msha-controller-operator-history