# Relationship history for MSHA mine 1901167

Current hierarchy: **Strategic Commercial Realty Inc → Rawson Materials → Plant 9**

- 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

- **controller_controls_mine:** O & G Industries Inc → Plant 9; 2001-04-12 to 2025-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Rampco Construction Co. Inc. → Plant 9; 2007-07-17 to 2023-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Androlewicz → Plant 9; 2007-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Androlewicz → Rampco Construction Co. Inc.; 2007-07-17 to 2023-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Rawson Materials → Plant 9; 2023-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O & G Industries Inc → Rawson Materials; 2023-11-01 to 2025-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Strategic Commercial Realty Inc → Plant 9; 2025-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Strategic Commercial Realty Inc → Rawson Materials; 2025-04-17 to current/open; source msha-controller-operator-history