# Relationship history for MSHA mine 1510674

Current hierarchy: **James L  Griffith → D & A Coal Company Inc → No H-7 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:** James L  Griffith et al → No H-7 Mine; 1970-01-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & A Coal Company Inc → No H-7 Mine; 1977-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James L  Griffith et al → D & A Coal Company Inc; 1977-08-01 to current/open; source msha-controller-operator-history