# Relationship history for MSHA mine 1601017

Current hierarchy: **Smith Gladys D → Accardo-Deutsch Material → Accardo-Deutsch Material**

- 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:** Smith Gladys D → Accardo-Deutsch Material; 1981-07-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Accardo-Deutsch Material → Accardo-Deutsch Material; 1981-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Gladys D → Accardo-Deutsch Material; 1981-09-01 to current/open; source msha-controller-operator-history