# Relationship history for MSHA mine 0202991

Current hierarchy: **Garry  Hayes; Richard  Gruber → Sunrise Materials LLC → Portable #1**

- 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:** Sunrise Materials LLC → Portable #1; 2002-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Gruber et al → Portable #1; 2002-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Gruber et al → Sunrise Materials LLC; 2002-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Garry  Hayes et al → Sunrise Materials LLC; 2002-07-29 to current/open; source msha-controller-operator-history