# Relationship history for MSHA mine 4604816

Current hierarchy: **Sizemore James N → Bookie Bear Coal Company Inc → No 11 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Unidyne Corp → No 11 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bergoo Coal Company Inc → No 11 Mine; 1975-09-18 to 1976-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Unidyne Corp → Bergoo Coal Company Inc; 1975-09-18 to 1976-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Bookie Bear Coal Company Inc → No 11 Mine; 1976-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sizemore James N → No 11 Mine; 1976-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sizemore James N → Bookie Bear Coal Company Inc; 1976-04-23 to current/open; source msha-controller-operator-history