# Relationship history for MSHA mine 2602498

Current hierarchy: **Robert  Evans; Chuck W  Saarloos → CC Crushing Corporation of Nevada → Portable #1**

- 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:** Curtis Crushing → Portable #1; 2002-07-11 to 2006-03-05; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Curtis → Portable #1; 2002-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Curtis → Curtis Crushing; 2002-07-11 to 2006-03-05; source msha-controller-operator-history
- **operator_operates_mine:** CC Crushing Corporation of Nevada → Portable #1; 2006-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Evans  et al → Portable #1; 2006-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Evans  et al → CC Crushing Corporation of Nevada; 2006-03-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chuck W  Saarloos  et al → CC Crushing Corporation of Nevada; 2006-03-06 to current/open; source msha-controller-operator-history