# Relationship history for MSHA mine 3304159

Current hierarchy: **Robert L  Stewart → Sunnydale Mining → Sunnydale Mining**

- 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:** Sunnydale Farms → Sunnydale Mining; 1989-04-01 to 1992-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Stewart → Sunnydale Mining; 1989-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Stewart → Sunnydale Farms; 1989-04-01 to 1992-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Sunnydale Farms → Sunnydale Mining; 1992-01-02 to 1993-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Testa Leonard J → Sunnydale Mining; 1992-01-02 to 1993-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Testa Leonard J → Sunnydale Farms; 1992-01-02 to 1993-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Sunnydale Mining → Sunnydale Mining; 1993-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Stewart → Sunnydale Mining; 1993-10-01 to current/open; source msha-controller-operator-history