# Relationship history for MSHA mine 1400224

Current hierarchy: **Palmer Will → Cherokee County Clay → Cherokee County Clay Pit**

- 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:** W S Dickey Clay Manufacturing Company → Cherokee County Clay Pit; 1950-01-01 to 1987-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Hepworth Plc → Cherokee County Clay Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hepworth Plc → W S Dickey Clay Manufacturing Company; 1950-01-01 to 1987-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee County Clay → Cherokee County Clay Pit; 1987-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Palmer Will → Cherokee County Clay Pit; 1987-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Palmer Will → Cherokee County Clay; 1987-04-28 to current/open; source msha-controller-operator-history