# Relationship history for MSHA mine 2602723

Current hierarchy: **Ladd  Gilbert; William  Gilbert → VT Construction, Inc → VT Crusher**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** VT Construction, Inc → VT Crusher; 2012-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Gilbert et al → VT Crusher; 2012-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Gilbert et al → VT Construction, Inc; 2012-09-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ladd  Gilbert et al → VT Construction, Inc; 2012-09-24 to current/open; source msha-controller-operator-history