# Relationship history for MSHA mine 1901263

Current hierarchy: **Helen E Danek; Thomas P Danek Jr. → ZOAR STONE & GRAVEL PROCESSING DIVISION → ZOAR STONE & GRAVEL**

- 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:** Zoar Stone & Gravel Processing Division → ZOAR STONE & GRAVEL; 2017-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thomas P Danek Jr. et al → ZOAR STONE & GRAVEL; 2017-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas P Danek Jr. et al → Zoar Stone & Gravel Processing Division; 2017-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Helen E Danek et al → Zoar Stone & Gravel Processing Division; 2017-03-09 to current/open; source msha-controller-operator-history