# Relationship history for MSHA mine 0400030

Current hierarchy: **John R  Struiksma → WEST COAST AGGREGATE SUPPLY → WEST COAST BRUBAKER-MANN**

- 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:** Brubaker-Mann Inc → WEST COAST BRUBAKER-MANN; 1950-01-01 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Dorothy E  Mann → WEST COAST BRUBAKER-MANN; 1950-01-01 to 2023-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Dorothy E  Mann → Brubaker-Mann Inc; 1950-01-01 to 2023-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Marvin J  Struiksma et al → WEST COAST BRUBAKER-MANN; 2000-06-19 to 2026-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Julie  Clemmer et al → WEST COAST BRUBAKER-MANN; 2023-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Julie  Clemmer et al → Brubaker-Mann Inc; 2023-02-08 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Jennifer  Brandt et al → Brubaker-Mann Inc; 2023-02-08 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Janice  Chagoya et al → Brubaker-Mann Inc; 2023-02-08 to 2024-02-09; source msha-controller-operator-history
- **controller_controls_operator:** John  Mann et al → Brubaker-Mann Inc; 2023-02-08 to 2024-02-09; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Aggregate Supply → WEST COAST BRUBAKER-MANN; 2024-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin J  Struiksma et al → West Coast Aggregate Supply; 2024-02-10 to 2026-01-26; source msha-controller-operator-history
- **controller_controls_mine:** John R  Struiksma et al → WEST COAST BRUBAKER-MANN; 2026-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Struiksma et al → West Coast Aggregate Supply; 2026-01-27 to current/open; source msha-controller-operator-history