# Relationship history for MSHA mine 3402205

Current hierarchy: **Jimmy R Abernathy; Brett G Abernathy → Switchback Stone, LLC → Calhoun Pit #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:** Brett G Abernathy et al → Calhoun Pit #1; 2020-05-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Switchback Stone, LLC → Calhoun Pit #1; 2020-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett G Abernathy et al → Switchback Stone, LLC; 2020-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy R Abernathy et al → Switchback Stone, LLC; 2020-05-18 to current/open; source msha-controller-operator-history