# Relationship history for MSHA mine 0203390

Current hierarchy: **Summit Materials LLC → Arizona Materials → Plant 1 Avondale**

- 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:** Harold  Elam → Plant 1 Avondale; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Plant 1 Avondale; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Diamondback Sand and Rock LLC → Plant 1 Avondale; 2017-10-25 to 2024-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Travis  Williams → Plant 1 Avondale; 2017-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Williams → Diamondback Sand and Rock LLC; 2017-10-25 to 2024-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Arizona Materials → Plant 1 Avondale; 2024-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Arizona Materials; 2024-03-07 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Arizona Materials; 2024-03-07 to current/open; source msha-controller-operator-history