# Relationship history for MSHA mine 4607336

Current hierarchy: **Craddock Robert L & Robert P → Craddock & Son Coal Company Inc → No 13 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 13 Mine; 1974-10-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Firerock Energy Inc → No 13 Mine; 1987-07-01 to 1988-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Richmond Barbara → No 13 Mine; 1987-07-01 to 1988-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Richmond Barbara → Firerock Energy Inc; 1987-07-01 to 1988-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Craddock & Son Coal Company Inc → No 13 Mine; 1988-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craddock Robert L & Robert P → Craddock & Son Coal Company Inc; 1988-06-13 to current/open; source msha-controller-operator-history