# Relationship history for MSHA mine 1401828

Current hierarchy: **Summit Materials LLC → Cornejo & Sons, LLC → Portable Plant #6**

- 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:** Summit Materials LLC → Portable Plant #6; 2011-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cornejo & Sons, LLC → Portable Plant #6; 2022-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Cornejo & Sons, LLC; 2022-06-09 to current/open; source msha-controller-operator-history