# Relationship history for MSHA mine 4404573

Current hierarchy: **Davidson J E--J D Nicewonder & W C Southern → Contracting Enterprises → No 2 Strip & Auger**

- 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

- **controller_controls_mine:** Davidson J E--J D Nicewonder & W C Southern → No 2 Strip & Auger; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Contracting Enterprises → No 2 Strip & Auger; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davidson J E--J D Nicewonder & W C Southern → Contracting Enterprises; 1976-12-01 to current/open; source msha-controller-operator-history