# Relationship history for MSHA mine 4601287

Current hierarchy: **Ray William A → Clay Kittanning Coal Company Inc → 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

- **controller_controls_mine:** Ray William A → No 4 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Chemical Coal Co → No 4 Mine; 1950-01-01 to 1974-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Chemical Coal Co → No 4 Mine; 1950-01-01 to 1974-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Chemical Coal Co → Chemical Coal Co; 1950-01-01 to 1974-09-25; source msha-controller-operator-history
- **operator_operates_mine:** Clay Kittanning Coal Company Inc → No 4 Mine; 1974-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ray William A → Clay Kittanning Coal Company Inc; 1974-09-26 to current/open; source msha-controller-operator-history