# Relationship history for MSHA mine 4703674

Current hierarchy: **Marion  Homann → Homann Excavating → Screen**

- 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:** Homann Excavating → Screen; 2012-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marion  Homann → Screen; 2012-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marion  Homann → Homann Excavating; 2012-10-12 to current/open; source msha-controller-operator-history