# Relationship history for MSHA mine 0900043

Current hierarchy: **Klein Karl → Georgia Vitrified Clay Corp → Bel Air**

- 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:** Georgia Vitrified Clay Corp → Bel Air; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Klein Karl → Bel Air; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klein Karl → Georgia Vitrified Clay Corp; 1950-01-01 to current/open; source msha-controller-operator-history