# Relationship history for MSHA mine 2103618

Current hierarchy: **Jim A  Burmeister → Jim's Gravel → Kolman Screen Plant**

- 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:** Jim's Gravel → Kolman Screen Plant; 2008-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jim A  Burmeister → Kolman Screen Plant; 2008-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jim A  Burmeister → Jim's Gravel; 2008-05-13 to current/open; source msha-controller-operator-history