# Relationship history for MSHA mine 0405851

Current hierarchy: **Jeff  Kroeker; Jill L.  Kroeker → Kroeker Inc. → Portable #4**

- 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:** Joyce  Kroeker et al → Portable #4; 2009-06-17 to 2024-05-23; source msha-controller-operator-history
- **operator_operates_mine:** Kroeker Inc. → Portable #4; 2012-07-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joyce  Kroeker et al → Kroeker Inc.; 2012-07-03 to 2024-05-23; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kroeker et al → Kroeker Inc.; 2012-07-03 to 2024-05-23; source msha-controller-operator-history
- **controller_controls_mine:** Jeff  Kroeker et al → Portable #4; 2024-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Kroeker et al → Kroeker Inc.; 2024-05-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jill L.  Kroeker et al → Kroeker Inc.; 2024-05-24 to current/open; source msha-controller-operator-history