# Relationship history for MSHA mine 2602220

Current hierarchy: **Hugh Roy  Marshall → Consolidated Virginia Mining Company → SUTRO MINE**

- 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:** Consolidated Virginia Mining Company → SUTRO MINE; 1992-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hugh Roy  Marshall → SUTRO MINE; 1992-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hugh Roy  Marshall → Consolidated Virginia Mining Company; 1992-11-01 to current/open; source msha-controller-operator-history