# Relationship history for MSHA mine 4801902

Current hierarchy: **Cliff E  Simpson → C&H Excavation LLC → C&H Portable**

- 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:** Cliff E  Simpson → C&H Portable; 2019-01-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C&H Excavation LLC → C&H Portable; 2025-08-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cliff E  Simpson → C&H Excavation LLC; 2025-08-14 to current/open; source msha-controller-operator-history