# Relationship history for MSHA mine 0203157

Current hierarchy: **Greg Investment LLC; Rick Investments LLC → Sierra Materials, LLC → Sierra 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:** Sierra Materials, LLC → Sierra Pit; 2007-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Greg Investment LLC et al → Sierra Pit; 2007-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Greg Investment LLC et al → Sierra Materials, LLC; 2007-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick Investments LLC et al → Sierra Materials, LLC; 2007-01-27 to current/open; source msha-controller-operator-history