# Relationship history for MSHA mine 4104862

Current hierarchy: **Summit Materials LLC → Laredo Paving, Inc → LU821**

- 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:** Bob  Price → LU821; 1998-07-01 to 2018-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Laredo Paving, Inc → LU821; 2011-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Price → Laredo Paving, Inc; 2011-05-24 to 2018-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → LU821; 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