# Relationship history for MSHA mine 4703103

Current hierarchy: **Terri  Stelter → A-1 Materials Inc → Wash Plant 2**

- 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:** Terri  Stelter  et al → Wash Plant 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A-1 Materials Inc → Wash Plant 2; 1997-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terri  Stelter  et al → A-1 Materials Inc; 1997-05-01 to current/open; source msha-controller-operator-history