# Relationship history for MSHA mine 4703399

Current hierarchy: **Tom  Halquist; Bill  Halquist → Badger Sandstone, LLC. → Badger Sandstone, 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Badger Sandstone LLC → Badger Sandstone, LLC.; 2004-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis W  Olszewski → Badger Sandstone, LLC.; 2004-10-13 to 2007-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Dennis W  Olszewski → Badger Sandstone LLC; 2004-10-13 to 2007-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Halquist et al → Badger Sandstone, LLC.; 2007-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Halquist et al → Badger Sandstone LLC; 2007-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Halquist et al → Badger Sandstone LLC; 2007-03-02 to current/open; source msha-controller-operator-history