# Relationship history for MSHA mine 4700068

Current hierarchy: **William G  Hausz Jr; Donald C  Hausz → Hausz Bros. Inc. → Portable Plant #1**

- 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:** Hausz Bros. Inc. → Portable Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William G  Hausz Jr et al → Portable Plant #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William G  Hausz Jr et al → Hausz Bros. Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald C  Hausz et al → Hausz Bros. Inc.; 1950-01-01 to current/open; source msha-controller-operator-history