# Relationship history for MSHA mine 2401915

Current hierarchy: **C  Eugene  Shumaker → Shumaker Trucking & Excavating Contractors Inc → STE Crushing Spread #1**

- 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:** Shumaker Trucking & Excavating Contractors Inc → STE Crushing Spread #1; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** C  Eugene  Shumaker → STE Crushing Spread #1; 1990-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C  Eugene  Shumaker → Shumaker Trucking & Excavating Contractors Inc; 1990-05-01 to current/open; source msha-controller-operator-history