# Relationship history for MSHA mine 4502640

Current hierarchy: **Darold  Dietz → Dietz Bros Alder Bluff Inc → Dietz Brothers Alder Bluff Incorporated**

- 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

- **operator_operates_mine:** Josum Inc → Dietz Brothers Alder Bluff Incorporated; 1979-01-01 to 1984-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Josum Inc → Dietz Brothers Alder Bluff Incorporated; 1979-01-01 to 1984-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Josum Inc → Josum Inc; 1979-01-01 to 1984-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Dietz Bros Alder Bluff Inc → Dietz Brothers Alder Bluff Incorporated; 1984-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Darold  Dietz  et al → Dietz Brothers Alder Bluff Incorporated; 1984-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darold  Dietz  et al → Dietz Bros Alder Bluff Inc; 1984-10-02 to current/open; source msha-controller-operator-history