# Relationship history for MSHA mine 2602746

Current hierarchy: **Ladd  Gilbert; William  Gilbert → VT Construction LLC → 817 Crusher 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:** VT Construction LLC → 817 Crusher Plant; 2013-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ladd  Gilbert et al → 817 Crusher Plant; 2013-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ladd  Gilbert et al → VT Construction LLC; 2013-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Gilbert et al → VT Construction LLC; 2013-08-02 to current/open; source msha-controller-operator-history