# Relationship history for MSHA mine 4300709

Current hierarchy: **Tammy S  Wagner → Wagner's Construction Inc. → Cedar Rapids 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

- **operator_operates_mine:** Wagner's Construction Inc. → Cedar Rapids Crusher; 2009-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tammy S  Wagner → Cedar Rapids Crusher; 2009-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tammy S  Wagner → Wagner's Construction Inc.; 2009-09-02 to current/open; source msha-controller-operator-history