# Relationship history for MSHA mine 0201966

Current hierarchy: **Hart Dale W & John H → H & H Associates → Hart & Associate 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** H & H Associates → Hart & Associate Mine; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hart Dale W & John H → Hart & Associate Mine; 1980-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hart Dale W & John H → H & H Associates; 1980-02-01 to current/open; source msha-controller-operator-history