# Relationship history for MSHA mine 4801634

Current hierarchy: **Mark D  Hettinger → Hettinger Welding Inc → RAG Scoria Pit**

- 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:** Hettinger Welding Inc → RAG Scoria Pit; 2003-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mark D  Hettinger et al → RAG Scoria Pit; 2003-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark D  Hettinger et al → Hettinger Welding Inc; 2003-05-26 to current/open; source msha-controller-operator-history