# Relationship history for MSHA mine 3500807

Current hierarchy: **Michael  Bernert; Dave  Bernert → WCP, Inc → WILLAMETTE RIVER**

- 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:** Joe Bernert Towing Company Inc → WILLAMETTE RIVER; 1950-01-01 to 2008-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Thomas L  Bernert → WILLAMETTE RIVER; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas L  Bernert → Joe Bernert Towing Company Inc; 1950-01-01 to 2008-03-27; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Bernert et al → WILLAMETTE RIVER; 2007-08-01 to 2022-06-30; source msha-controller-operator-history
- **operator_operates_mine:** WCP, Inc → WILLAMETTE RIVER; 2008-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Bernert et al → WCP, Inc; 2008-03-28 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_operator:** David  Bernert et al → WCP, Inc; 2008-03-28 to 2022-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Bernert et al → WILLAMETTE RIVER; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Bernert et al → WCP, Inc; 2022-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Bernert et al → WCP, Inc; 2022-07-01 to current/open; source msha-controller-operator-history