# Relationship history for MSHA mine 2103963

Current hierarchy: **Corey Douglas  Suess → C & D SERVICES, LLC → SUESS & SONS SAND & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C & D SERVICES, LLC → SUESS & SONS SAND & GRAVEL; 2020-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Corey Douglas  Suess → SUESS & SONS SAND & GRAVEL; 2020-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corey Douglas  Suess → C & D SERVICES, LLC; 2020-02-14 to current/open; source msha-controller-operator-history