# Relationship history for MSHA mine 3604368

Current hierarchy: **Ansell Earl → Earl Ansell Coal Company → Joyce**

- 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:** Henry Davis → Joyce; 1950-01-01 to 1974-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Davis Henry → Joyce; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Davis Henry → Henry Davis; 1950-01-01 to 1974-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Earl Ansell Coal Company → Joyce; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ansell Earl → Joyce; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ansell Earl → Earl Ansell Coal Company; 1975-01-01 to current/open; source msha-controller-operator-history