# Relationship history for MSHA mine 0405058

Current hierarchy: **Eugene B  Ceccotti → Shamrock Materials Inc → Ukiah 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Eugene B  Ceccotti → Ukiah Plant; 1988-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shamrock Materials Inc → Ukiah Plant; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene B  Ceccotti → Shamrock Materials Inc; 1989-10-01 to current/open; source msha-controller-operator-history