# Relationship history for MSHA mine 2103533

Current hierarchy: **Todd R  Plaisted → Plaisted Companies Inc → CEC Screen-it**

- 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:** Todd R  Plaisted → CEC Screen-it; 1985-09-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Plaisted Companies Inc → CEC Screen-it; 2006-05-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd R  Plaisted → Plaisted Companies Inc; 2006-05-03 to current/open; source msha-controller-operator-history