# Relationship history for MSHA mine 5400340

Current hierarchy: **Jose F (Vazquez)  Criado → Drillex Se → Proyecto Montehiedra-Humacao**

- 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:** Drillex Se → Proyecto Montehiedra-Humacao; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jose F (Vazquez)  Criado  et al → Proyecto Montehiedra-Humacao; 1992-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jose F (Vazquez)  Criado  et al → Drillex Se; 1992-08-01 to current/open; source msha-controller-operator-history