# Relationship history for MSHA mine 0402001

Current hierarchy: **Shuster Charles → Shuster'S Willits Ready Mix Inc → Willits Pit & Mill**

- 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:** Willits Ready Mix → Willits Pit & Mill; 1984-01-01 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Graf Donald & Roland → Willits Pit & Mill; 1984-01-01 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Graf Donald & Roland → Willits Ready Mix; 1984-01-01 to 1988-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Shuster'S Willits Ready Mix Inc → Willits Pit & Mill; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shuster Charles → Willits Pit & Mill; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shuster Charles → Shuster'S Willits Ready Mix Inc; 1988-04-01 to current/open; source msha-controller-operator-history