# Relationship history for MSHA mine 0202203

Current hierarchy: **Stanley  Novak → Winona Cinders → Power Screen (Portable)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Chandler Materials → Power Screen (Portable); 1984-04-01 to 1984-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Chandler Tony → Power Screen (Portable); 1984-04-01 to 1984-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Chandler Tony → Chandler Materials; 1984-04-01 to 1984-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Winona Cinders → Power Screen (Portable); 1984-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley  Novak → Power Screen (Portable); 1984-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Novak → Winona Cinders; 1984-06-13 to current/open; source msha-controller-operator-history