# Relationship history for MSHA mine 4603848

Current hierarchy: **Biglow Corp → Capitol Fuels Inc → No 5 Deep**

- 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:** Capitol Fuels Inc → No 5 Deep; 1950-01-01 to 1984-07-08; source msha-controller-operator-history
- **controller_controls_mine:** G B  Frederick → No 5 Deep; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** G B  Frederick → Capitol Fuels Inc; 1950-01-01 to 1984-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Fuels Inc → No 5 Deep; 1984-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Biglow Corp → No 5 Deep; 1984-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Biglow Corp → Capitol Fuels Inc; 1984-07-09 to current/open; source msha-controller-operator-history