# Relationship history for MSHA mine 4601999

Current hierarchy: **Williams Perry → Perry Coal Company → No 4 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:** Fairtex Coal Company Inc → No 4 Mine; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Dempsey Jack A → No 4 Mine; 1950-01-01 to 1976-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Dempsey Jack A → Fairtex Coal Company Inc; 1950-01-01 to 1974-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Williams Perry → No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Perry Coal Company → No 4 Mine; 1974-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Perry → Perry Coal Company; 1974-08-01 to current/open; source msha-controller-operator-history