# Relationship history for MSHA mine 5400499

Current hierarchy: **Ruben  Ortiz → Hollow-Core Slab of PR → Hollow-Core Slab of PR**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Hollow-Core Slab of PR → Hollow-Core Slab of PR; 2018-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ruben  Ortiz → Hollow-Core Slab of PR; 2018-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ruben  Ortiz → Hollow-Core Slab of PR; 2018-05-03 to current/open; source msha-controller-operator-history