# Relationship history for MSHA mine 4103573

Current hierarchy: **Mary E  Brashier → Bill Brashier Excavating Company → BILL BRASHIER EXCVT.CO.CORP.**

- 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:** Bill Brashier Excavating Company → BILL BRASHIER EXCVT.CO.CORP.; 1989-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mary E  Brashier  et al → BILL BRASHIER EXCVT.CO.CORP.; 1989-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mary E  Brashier  et al → Bill Brashier Excavating Company; 1989-02-01 to current/open; source msha-controller-operator-history