# Relationship history for MSHA mine 4604292

Current hierarchy: **Craddock Robert L & Robert P → Dry Hill Coal Company → No 2 Strip Mine**

- 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

- **controller_controls_mine:** Craddock Robert L & Robert P → No 2 Strip Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dry Hill Coal Company → No 2 Strip Mine; 1974-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craddock Robert L & Robert P → Dry Hill Coal Company; 1974-06-13 to current/open; source msha-controller-operator-history