# Relationship history for MSHA mine 1401788

Current hierarchy: **Kolt R  Huber; Soterios T  Huber → Hardrock Sand & Gravel LLC → Hardrock 3**

- 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:** Soterios T  Huber et al → Hardrock 3; 2006-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hardrock Sand & Gravel LLC → Hardrock 3; 2017-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Soterios T  Huber et al → Hardrock Sand & Gravel LLC; 2017-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kolt R  Huber  et al → Hardrock Sand & Gravel LLC; 2017-05-18 to current/open; source msha-controller-operator-history