# Relationship history for MSHA mine 1517432

Current hierarchy: **Stanley R  Ditty → Del Rio Inc → Dr #6**

- 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

- **controller_controls_mine:** Stanley R  Ditty → Dr #6; 1989-10-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Del Rio Inc → Dr #6; 1993-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley R  Ditty → Del Rio Inc; 1993-08-01 to current/open; source msha-controller-operator-history