# Relationship history for MSHA mine 3500472

Current hierarchy: **Michael  Bernert; Dave  Bernert → Wilsonville Concrete Products → WCP Inc**

- 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

- **operator_operates_mine:** Commercial Sand & Gravel Company → WCP Inc; 1950-01-01 to 1990-06-12; source msha-controller-operator-history
- **controller_controls_mine:** C B  Feller → WCP Inc; 1950-01-01 to 1990-06-12; source msha-controller-operator-history
- **controller_controls_operator:** C B  Feller → Commercial Sand & Gravel Company; 1950-01-01 to 1990-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Commercial Redi-Mix & Aggregate Inc → WCP Inc; 1990-06-13 to 2007-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Oregon Tractor & Equipment Company Inc → WCP Inc; 1990-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oregon Tractor & Equipment Company Inc → Commercial Redi-Mix & Aggregate Inc; 1990-06-13 to 2007-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Wilsonville Concrete Products → WCP Inc; 2007-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Bernert et al → WCP Inc; 2007-08-01 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_operator:** David  Bernert et al → Wilsonville Concrete Products; 2007-08-01 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Bernert et al → Wilsonville Concrete Products; 2007-08-01 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Bernert et al → WCP Inc; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Bernert et al → Wilsonville Concrete Products; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Bernert et al → Wilsonville Concrete Products; 2022-07-01 to current/open; source msha-controller-operator-history