# Relationship history for MSHA mine 4404938

Current hierarchy: **Davis James-James Mc Vey → S M A Coal Company Inc → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Davis James-James Mc Vey Et Al → No 3 Mine; 1976-06-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** S M A Coal Company Inc → No 3 Mine; 1978-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis James-James Mc Vey Et Al → S M A Coal Company Inc; 1978-01-01 to current/open; source msha-controller-operator-history