# Relationship history for MSHA mine 1002309

Current hierarchy: **Laef  Wallin → L & M Farm Industries Inc → L & M Portable**

- 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:** L & M Farm Industries Inc → L & M Portable; 2019-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Laef  Wallin → L & M Portable; 2019-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Laef  Wallin → L & M Farm Industries Inc; 2019-06-17 to current/open; source msha-controller-operator-history