# Relationship history for MSHA mine 4103817

Current hierarchy: **Summit Materials LLC → Laredo Paving Inc. → LU160 PORTABLE CRUSHER**

- 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:** AA  Price → LU160 PORTABLE CRUSHER; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Price Construction → LU160 PORTABLE CRUSHER; 1994-05-01 to 2001-02-26; source msha-controller-operator-history
- **controller_controls_operator:** AA  Price → Price Construction; 1994-05-01 to 2001-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Bob  Price → LU160 PORTABLE CRUSHER; 1998-07-01 to 2018-01-11; source msha-controller-operator-history
- **operator_operates_mine:** Laredo Paving Inc. → LU160 PORTABLE CRUSHER; 2001-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bob  Price → Laredo Paving Inc.; 2001-02-27 to 2018-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → LU160 PORTABLE CRUSHER; 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