# Relationship history for MSHA mine 4401580

Current hierarchy: **Hackney Frank W → Hackney Fuel Company Inc → No 3 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:** Little Rock Coal Company → No 3 Mine; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Fletcher Paul & Lawson Ramey → No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fletcher Paul & Lawson Ramey → Little Rock Coal Company; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Hackney Frank W → No 3 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hackney Fuel Company Inc → No 3 Mine; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hackney Frank W → Hackney Fuel Company Inc; 1974-08-01 to current/open; source msha-controller-operator-history