# Relationship history for MSHA mine 0502591

Current hierarchy: **Gary L  Schlosser; Tom D  Schlosser → Schlosser Inc → Erker 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:** Schlosser Inc → Erker Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary L  Schlosser et al → Erker Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary L  Schlosser et al → Schlosser Inc; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom D  Schlosser et al → Schlosser Inc; 1950-01-01 to current/open; source msha-controller-operator-history