# Relationship history for MSHA mine 2801030

Current hierarchy: **Fred  Vahlsing III → Excavating Materials & Equipment Inc. → Campo Mine/Campo Construction Co Inc**

- 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

- **controller_controls_mine:** Fred  Vahlsing III → Campo Mine/Campo Construction Co Inc; 1997-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Campo Construction Co. Inc. → Campo Mine/Campo Construction Co Inc; 2010-03-15 to 2014-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Lucia  Campo → Campo Mine/Campo Construction Co Inc; 2010-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lucia  Campo → Campo Construction Co. Inc.; 2010-03-15 to 2014-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Excavating Materials & Equipment Inc. → Campo Mine/Campo Construction Co Inc; 2014-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred  Vahlsing III → Excavating Materials & Equipment Inc.; 2014-05-01 to current/open; source msha-controller-operator-history