# Relationship history for MSHA mine 0202315

Current hierarchy: **Connie T  Campbell → Kingman Redi-Mix Inc → SCREEN 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:** Kingman Redi-Mix Inc → SCREEN PLANT; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Connie T  Campbell → SCREEN PLANT; 1986-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Connie T  Campbell → Kingman Redi-Mix Inc; 1986-06-01 to current/open; source msha-controller-operator-history