# Relationship history for MSHA mine 2103565

Current hierarchy: **Todd R  Schumacher; Scott T  Schumacher → Schumacher Excavating, Inc. → Schumacher Excavating**

- 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:** Schumacher Excavating, Inc. → Schumacher Excavating; 2007-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carol M  Schumacher et al → Schumacher Excavating; 2007-03-27 to 2026-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Carol M  Schumacher et al → Schumacher Excavating, Inc.; 2007-03-27 to 2026-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Allan L  Schumacher et al → Schumacher Excavating, Inc.; 2007-03-27 to 2026-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Todd R  Schumacher et al → Schumacher Excavating; 2026-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd R  Schumacher et al → Schumacher Excavating, Inc.; 2026-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott T  Schumacher et al → Schumacher Excavating, Inc.; 2026-08-11 to current/open; source msha-controller-operator-history