# Relationship history for MSHA mine 4604457

Current hierarchy: **Klaproth Abner H → Big Fork Coal Company Inc → No 15**

- 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:** Klaproth Abner H → No 15; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alabama Fuel Company → No 15; 1974-11-13 to 1982-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Klaproth Roy E → No 15; 1974-11-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klaproth Roy E → Alabama Fuel Company; 1974-11-13 to 1982-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Coal Company Inc → No 15; 1982-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klaproth Abner H → Big Fork Coal Company Inc; 1982-07-23 to current/open; source msha-controller-operator-history