# Relationship history for MSHA mine 2103372

Current hierarchy: **Robert D  Tolk → Tolk Graveling, LLC → Crushing Plant**

- 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:** Ardeen Tolk Graveling, Inc. → Crushing Plant; 2003-07-30 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Ardeen R  Tolk → Crushing Plant; 2003-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ardeen R  Tolk → Ardeen Tolk Graveling, Inc.; 2003-07-30 to 2011-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Tolk Graveling, LLC → Crushing Plant; 2011-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Tolk → Crushing Plant; 2011-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Tolk → Tolk Graveling, LLC; 2011-04-01 to current/open; source msha-controller-operator-history