# Relationship history for MSHA mine 4603936

Current hierarchy: **Cline Jack → Alaska Fuel Co → No 1 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

- **operator_operates_mine:** Black Diamond Mining Company Inc → No 1 Mine; 1973-01-01 to 1975-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Talbert Ronald B Ii → No 1 Mine; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Talbert Ronald B Ii → Black Diamond Mining Company Inc; 1973-01-01 to 1975-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Alaska Fuel Co → No 1 Mine; 1975-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cline Jack → No 1 Mine; 1975-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cline Jack → Alaska Fuel Co; 1975-04-23 to current/open; source msha-controller-operator-history