# Relationship history for MSHA mine 4703925

Current hierarchy: **Matthew  Baumhardt → M.D. Crushing & Excavating, LLC. → M.D. Crushing & Excavating, LLC.**

- 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:** M.D. Crushing & Excavating LLC → M.D. Crushing & Excavating, LLC.; 2022-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Baumhardt → M.D. Crushing & Excavating, LLC.; 2022-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Baumhardt → M.D. Crushing & Excavating LLC; 2022-06-22 to current/open; source msha-controller-operator-history