# Relationship history for MSHA mine 2103338

Current hierarchy: **Bruce A  Dresel → Dresel Contracting, Inc. → Portable 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Dresel Contracting, Inc. → Portable Screen Plant #1; 2002-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bruce A  Dresel et al → Portable Screen Plant #1; 2002-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce A  Dresel et al → Dresel Contracting, Inc.; 2002-11-25 to current/open; source msha-controller-operator-history