# Relationship history for MSHA mine 3503979

Current hierarchy: **Sydric  Schuyler → S A Schuyler & Sons, Inc → S A Schuyler & Sons, Inc**

- 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:** S A Schuyler & Sons, Inc → S A Schuyler & Sons, Inc; 2026-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sydric  Schuyler → S A Schuyler & Sons, Inc; 2026-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sydric  Schuyler → S A Schuyler & Sons, Inc; 2026-02-10 to current/open; source msha-controller-operator-history