# Relationship history for MSHA mine 2104017

Current hierarchy: **Robert  Lorentz → W Lorentz & Sons Construction, Inc. → WLC-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:** Robert  Lorentz → WLC-2; 2021-02-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W Lorentz & Sons Construction, Inc. → WLC-2; 2021-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Lorentz → W Lorentz & Sons Construction, Inc.; 2021-10-05 to current/open; source msha-controller-operator-history