# Relationship history for MSHA mine 3503963

Current hierarchy: **Barbara  Ellis; Raymond  Ellis → Treeco Farms Inc → Portable Crushing Unit**

- 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:** Treeco Farms Inc → Portable Crushing Unit; 2024-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Raymond  Ellis et al → Portable Crushing Unit; 2024-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Raymond  Ellis et al → Treeco Farms Inc; 2024-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Barbara  Ellis et al → Treeco Farms Inc; 2024-09-12 to current/open; source msha-controller-operator-history