# Relationship history for MSHA mine 0203521

Current hierarchy: **Terri L Harguess; Sammy D Harguess → Sun Cor Underground Inc → South Mountain**

- 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:** Sammy D Harguess et al → South Mountain; 2022-04-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sun Cor Underground Inc → South Mountain; 2024-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sammy D Harguess et al → Sun Cor Underground Inc; 2024-12-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terri L Harguess et al → Sun Cor Underground Inc; 2024-12-13 to current/open; source msha-controller-operator-history