# Relationship history for MSHA mine 0201920

Current hierarchy: **State Of Arizona → Arizona Department Of Transportation → Cedar Rapids Screening Plt Eq #E79-104**

- 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:** State Of Arizona → Cedar Rapids Screening Plt Eq #E79-104; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Arizona Department Of Transportation → Cedar Rapids Screening Plt Eq #E79-104; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** State Of Arizona → Arizona Department Of Transportation; 1979-01-01 to current/open; source msha-controller-operator-history