# Relationship history for MSHA mine 5400263

Current hierarchy: **Amaury  Rodriguez → Inter-Services Sand-Gravel Inc → Gravero Las Bombas**

- 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:** Edvardo Alamo Umpierre → Gravero Las Bombas; 1981-03-01 to 1982-12-28; source msha-controller-operator-history
- **controller_controls_mine:** Umpierre Edvardo Alamo → Gravero Las Bombas; 1981-03-01 to 1982-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Umpierre Edvardo Alamo → Edvardo Alamo Umpierre; 1981-03-01 to 1982-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Inter-Services Sand-Gravel Inc → Gravero Las Bombas; 1982-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amaury  Rodriguez → Gravero Las Bombas; 1982-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amaury  Rodriguez → Inter-Services Sand-Gravel Inc; 1982-12-29 to current/open; source msha-controller-operator-history