# Relationship history for MSHA mine 3503874

Current hierarchy: **Dennis V  Snyder Jr; Danyeil  Snyder → Dennis V Snyder Jr Contractors → Herman Creek Quarry**

- 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

- **operator_operates_mine:** Dennis V Snyder Jr Contractors → Herman Creek Quarry; 2018-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dennis V  Snyder Jr et al → Herman Creek Quarry; 2018-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis V  Snyder Jr et al → Dennis V Snyder Jr Contractors; 2018-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Danyeil  Snyder et al → Dennis V Snyder Jr Contractors; 2018-11-05 to current/open; source msha-controller-operator-history