# Relationship history for MSHA mine 0505062

Current hierarchy: **MTFE Holdings; HFI LLC → Extreme Excavation → Screen Plant 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:** HFI LLC et al → Screen Plant 1; 2008-10-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Extreme Excavation → Screen Plant 1; 2016-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** HFI LLC et al → Extreme Excavation; 2016-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MTFE Holdings et al → Extreme Excavation; 2016-06-29 to current/open; source msha-controller-operator-history