# Relationship history for MSHA mine 0405375

Current hierarchy: **Richard G  Slechta Jr; Jeff  Slechta → Richard Slechta Jr → DANDY QUARTZ 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:** Richard Slechta Jr → DANDY QUARTZ MINE; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard G  Slechta Jr et al → DANDY QUARTZ MINE; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Slechta Jr et al → Richard Slechta Jr; 1999-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Slechta et al → Richard Slechta Jr; 1999-06-01 to current/open; source msha-controller-operator-history