# Relationship history for MSHA mine 2103651

Current hierarchy: **Gerhart  Larson → A-1 Excavating & Recycling Inc → A-1 Crusher**

- 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:** A-1 Excavating & Recycling Inc → A-1 Crusher; 2008-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerhart  Larson → A-1 Crusher; 2008-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerhart  Larson → A-1 Excavating & Recycling Inc; 2008-09-09 to current/open; source msha-controller-operator-history