# Relationship history for MSHA mine 2103639

Current hierarchy: **John J  Wavrin → Low Impact Excavators, Inc. → Reed Screener**

- 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:** Low Impact Excavators, Inc. → Reed Screener; 2008-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John J  Wavrin → Reed Screener; 2008-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John J  Wavrin → Low Impact Excavators, Inc.; 2008-07-08 to current/open; source msha-controller-operator-history