# Relationship history for MSHA mine 4104874

Current hierarchy: **Summit Materials LLC → Laredo Paving, Inc → LU824**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Bob  Price → LU824; 1998-07-01 to 2018-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Laredo Paving, Inc → LU824; 2011-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Price → Laredo Paving, Inc; 2011-04-18 to 2018-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → LU824; 2018-01-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Laredo Paving, Inc; 2018-01-12 to current/open; source msha-controller-operator-history