# Relationship history for MSHA mine 0404337

Current hierarchy: **Charles E  Beard → General Production Service Of Ca Inc → Taft Plant**

- 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:** Taft Ready Mix → Taft Plant; 1979-11-01 to 1987-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Lackey Bill → Taft Plant; 1979-11-01 to 1987-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Lackey Bill → Taft Ready Mix; 1979-11-01 to 1987-09-01; source msha-controller-operator-history
- **operator_operates_mine:** General Production Service Of Ca Inc → Taft Plant; 1987-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Beard et al → Taft Plant; 1987-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Beard et al → General Production Service Of Ca Inc; 1987-09-02 to current/open; source msha-controller-operator-history