# Relationship history for MSHA mine 0301939

Current hierarchy: **Alma M  Abernathy → Gerald Abernathy Backhoe & Dozer Service Inc → Abernathy Portable Plant #2**

- 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:** Alma M  Abernathy → Abernathy Portable Plant #2; 2006-04-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gerald Abernathy Backhoe & Dozer Service Inc → Abernathy Portable Plant #2; 2006-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alma M  Abernathy → Gerald Abernathy Backhoe & Dozer Service Inc; 2006-09-12 to current/open; source msha-controller-operator-history