# Relationship history for MSHA mine 4606228

Current hierarchy: **Harry G  Cooke; Larry David  Cochran → Deerfield Mining Company Inc → No 7b Mine**

- 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:** Deerfield Mining Company Inc → No 7b Mine; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harry G  Cooke et al → No 7b Mine; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harry G  Cooke et al → Deerfield Mining Company Inc; 1980-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry David  Cochran et al → Deerfield Mining Company Inc; 1980-09-01 to current/open; source msha-controller-operator-history