# Relationship history for MSHA mine 4103773

Current hierarchy: **Gary W  Culwell → PRO-ROK Inc → Domtar**

- 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:** Performance Unlimited Inc → Domtar; 1993-06-01 to 2002-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Ann  Allsup → Domtar; 1993-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ann  Allsup → Performance Unlimited Inc; 1993-06-01 to 2002-12-27; source msha-controller-operator-history
- **operator_operates_mine:** PRO-ROK Inc → Domtar; 2002-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary W  Culwell → Domtar; 2002-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary W  Culwell → PRO-ROK Inc; 2002-12-28 to current/open; source msha-controller-operator-history