# Relationship history for MSHA mine 1002104

Current hierarchy: **Hans  Borbonus → Cloverdale Nursery & Turf Farm → Portable Plant #2**

- 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:** Hans  Borbonus → Portable Plant #2; 2001-10-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cloverdale Nursery & Turf Farm → Portable Plant #2; 2006-11-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hans  Borbonus → Cloverdale Nursery & Turf Farm; 2006-11-22 to current/open; source msha-controller-operator-history