# Relationship history for MSHA mine 3608277

Current hierarchy: **Ambrosia Rose → Ambrosia Coal & Construction Company → Spagnola**

- 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:** Ambrosia Rose → Spagnola; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ambrosia Coal & Construction Company → Spagnola; 1991-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ambrosia Rose → Ambrosia Coal & Construction Company; 1991-09-01 to current/open; source msha-controller-operator-history