# Relationship history for MSHA mine 5400321

Current hierarchy: **Ramon Ponce  Fantauzzi → Ramon Ponce Enterprises → Gravero Juncos**

- 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:** Ramon Ponce Enterprises → Gravero Juncos; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ramon Ponce  Fantauzzi → Gravero Juncos; 1990-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramon Ponce  Fantauzzi → Ramon Ponce Enterprises; 1990-06-01 to current/open; source msha-controller-operator-history