# Relationship history for MSHA mine 5400373

Current hierarchy: **Juan H  Lamboy (Coriano) → Gravero H. P. → GRAVERO H.P.**

- 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:** Gravero H. P. → GRAVERO H.P.; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Juan H  Lamboy (Coriano) → GRAVERO H.P.; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Juan H  Lamboy (Coriano) → Gravero H. P.; 1995-08-01 to current/open; source msha-controller-operator-history