# Relationship history for MSHA mine 3003820

Current hierarchy: **Martin R  VanEtten → M & M Excavating → Martin VanEtten 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M & M Excavating → Martin VanEtten Mine; 2012-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin R  VanEtten → Martin VanEtten Mine; 2012-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin R  VanEtten → M & M Excavating; 2012-09-30 to current/open; source msha-controller-operator-history