# Relationship history for MSHA mine 1401719

Current hierarchy: **Summit Materials LLC → Cornejo & Sons LLC → Durbin Quarry**

- 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:** Cornejo Quality Stone LLC → Durbin Quarry; 2010-06-15 to 2011-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Cornejo Materials LLC → Durbin Quarry; 2010-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornejo Materials LLC → Cornejo Quality Stone LLC; 2010-06-15 to 2011-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Durbin Quarry; 2011-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cornejo & Sons LLC → Durbin Quarry; 2011-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Cornejo & Sons LLC; 2011-03-30 to current/open; source msha-controller-operator-history