# Relationship history for MSHA mine 4703422

Current hierarchy: **Chris  Homburg → Homburg Contractors, Inc. → Sandvik Qi442 Mobile Impact Crusher**

- 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:** Homburg Contractors, Inc. → Sandvik Qi442 Mobile Impact Crusher; 2005-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold N  Homburg → Sandvik Qi442 Mobile Impact Crusher; 2005-06-09 to 2016-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Harold N  Homburg → Homburg Contractors, Inc.; 2005-06-09 to 2016-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Homburg → Sandvik Qi442 Mobile Impact Crusher; 2016-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Homburg → Homburg Contractors, Inc.; 2016-11-23 to current/open; source msha-controller-operator-history