# Relationship history for MSHA mine 4300323

Current hierarchy: **Matthew  Thomas → Thomas Construction → Trudo and Sons Construction**

- 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:** Paul  Carrara et al → Trudo and Sons Construction; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Joseph P Carrara & Sons Inc → Trudo and Sons Construction; 1979-01-01 to 1987-06-01; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Carrara et al → Joseph P Carrara & Sons Inc; 1979-01-01 to 1987-06-01; source msha-controller-operator-history
- **operator_operates_mine:** Trudo Construction Company Inc → Trudo and Sons Construction; 1987-06-02 to 2017-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Graham J  Trudo → Trudo and Sons Construction; 1987-06-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Graham J  Trudo → Trudo Construction Company Inc; 1987-06-02 to 2017-12-05; source msha-controller-operator-history
- **operator_operates_mine:** Thomas Construction → Trudo and Sons Construction; 2017-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Matthew  Thomas → Trudo and Sons Construction; 2017-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew  Thomas → Thomas Construction; 2017-12-06 to current/open; source msha-controller-operator-history