# Relationship history for MSHA mine 0202301

Current hierarchy: **Dillon William E & Tamara Jo → Dillon & Son Inc → Dillon & Son**

- 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:** Dillon & Son Inc → Dillon & Son; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dillon William E & Tamara Jo → Dillon & Son; 1986-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dillon William E & Tamara Jo → Dillon & Son Inc; 1986-04-01 to current/open; source msha-controller-operator-history