# Relationship history for MSHA mine 0405144

Current hierarchy: **Borello Robert A → Borello Ranch Quarry → Borello Ranch Quarry**

- 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

- **controller_controls_mine:** Ralph  Johnson  et al → Borello Ranch Quarry; 1986-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** American Rock & Asphalt Inc → Borello Ranch Quarry; 1991-05-01 to 1991-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Ralph  Johnson  et al → American Rock & Asphalt Inc; 1991-05-01 to 1991-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Sam  Johnson  et al → American Rock & Asphalt Inc; 1991-05-01 to 1991-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Borello Ranch Quarry → Borello Ranch Quarry; 1991-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Borello Robert A → Borello Ranch Quarry; 1991-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Borello Robert A → Borello Ranch Quarry; 1991-12-02 to current/open; source msha-controller-operator-history