# Relationship history for MSHA mine 2103568

Current hierarchy: **Steven J  Jech → Edge Contracting, Inc. → Portable Screening 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

- **operator_operates_mine:** Edge Contracting, Inc. → Portable Screening Plant #1; 2007-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steven J  Jech → Portable Screening Plant #1; 2007-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven J  Jech → Edge Contracting, Inc.; 2007-04-03 to current/open; source msha-controller-operator-history