# Relationship history for MSHA mine 4703596

Current hierarchy: **Matthew M Koenig → Koenig's Sand & Stone LLC → Portable Crushing 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

- **controller_controls_mine:** Michael J Koenig → Portable Crushing Plant; 2003-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mikes Materials LLC → Portable Crushing Plant; 2010-07-15 to 2020-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Michael J Koenig → Mikes Materials LLC; 2010-07-15 to 2020-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Matthew M Koenig → Portable Crushing Plant; 2016-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Koenig's Sand & Stone LLC → Portable Crushing Plant; 2020-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matthew M Koenig → Koenig's Sand & Stone LLC; 2020-05-13 to current/open; source msha-controller-operator-history