# Relationship history for MSHA mine 3200747

Current hierarchy: **Kevin  Camas → Camas Sand & Gravel → Camas Gravel**

- 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:** Camas Sand & Gravel → Camas Gravel; 1996-08-01 to 2010-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Eugene  Camas → Camas Gravel; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene  Camas → Camas Sand & Gravel; 1996-08-01 to 2010-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Camas Sand & Gravel → Camas Gravel; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kevin  Camas → Camas Gravel; 2011-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kevin  Camas → Camas Sand & Gravel; 2011-01-01 to current/open; source msha-controller-operator-history