# Relationship history for MSHA mine 3500181

Current hierarchy: **Scott  Wadsworth → Wood Waste Reclamation, Inc. → Portable Plant # 1**

- 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:** Wadsworth Rock → Portable Plant # 1; 2000-01-01 to 2002-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Joe M  Wadsworth → Portable Plant # 1; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe M  Wadsworth → Wadsworth Rock; 2000-01-01 to 2002-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Wood Waste Reclamation, Inc. → Portable Plant # 1; 2002-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Wadsworth → Portable Plant # 1; 2002-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Wadsworth → Wood Waste Reclamation, Inc.; 2002-09-19 to current/open; source msha-controller-operator-history