# Relationship history for MSHA mine 4801773

Current hierarchy: **Gary W  Dickau; Jess E  Dickau → Dickau Grading, LLC → Screener #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Dickau Grading, LLC → Screener #1; 2013-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary W  Dickau et al → Screener #1; 2013-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Dickau et al → Dickau Grading, LLC; 2013-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jess E  Dickau et al → Dickau Grading, LLC; 2013-12-03 to current/open; source msha-controller-operator-history