# Relationship history for MSHA mine 4103186

Current hierarchy: **Licon Guillermo → Alamito Construction Company Inc → Ross Pit**

- 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

- **operator_operates_mine:** Alamito Construction Company Inc → Ross Pit; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Licon Guillermo → Ross Pit; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Licon Guillermo → Alamito Construction Company Inc; 1983-07-01 to current/open; source msha-controller-operator-history