# Relationship history for MSHA mine 0404730

Current hierarchy: **Borges Richard → Borges Rock Products Inc → Hansen Dam Plant**

- 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:** Channel & Basin Reclamation Inc → Hansen Dam Plant; 1984-10-01 to 1985-01-31; source msha-controller-operator-history
- **controller_controls_mine:** David B  Blomgren  et al → Hansen Dam Plant; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David B  Blomgren  et al → Channel & Basin Reclamation Inc; 1984-10-01 to 1985-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Borges Rock Products Inc → Hansen Dam Plant; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Borges Richard → Hansen Dam Plant; 1985-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Borges Richard → Borges Rock Products Inc; 1985-02-01 to current/open; source msha-controller-operator-history