# Relationship history for MSHA mine 2402474

Current hierarchy: **Steve L  Cavanaugh; Susie L  Cavanaugh → Nitty Gritty LLC → Rolling Glen Ranch Sand and Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Nitty Gritty Dirt LLC → Rolling Glen Ranch Sand and Gravel; 2007-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Susie L  Cavanaugh et al → Rolling Glen Ranch Sand and Gravel; 2007-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Susie L  Cavanaugh et al → Nitty Gritty Dirt LLC; 2007-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Cavanaugh et al → Nitty Gritty Dirt LLC; 2007-03-26 to current/open; source msha-controller-operator-history