# Relationship history for MSHA mine 0201948

Current hierarchy: **William H  Hyslip → Earth Products Inc → Big Bug 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Earth Products Inc → Big Bug Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William H  Hyslip → Big Bug Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Hyslip → Earth Products Inc; 1979-01-01 to current/open; source msha-controller-operator-history