# Relationship history for MSHA mine 1601498

Current hierarchy: **Shane  Cambre; Glynn  Huhn → Enon Sand and Gravel, LLC → Riverstone**

- 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:** Enon Ventures LLC → Riverstone; 2009-12-16 to 2011-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Shane  Cambre et al → Riverstone; 2009-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane  Cambre et al → Enon Ventures LLC; 2009-12-16 to 2011-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Glynn  Huhn et al → Enon Ventures LLC; 2009-12-16 to 2011-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Enon Sand and Gravel LLC → Riverstone; 2011-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shane  Cambre et al → Riverstone; 2011-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shane  Cambre et al → Enon Sand and Gravel LLC; 2011-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glynn  Huhn et al → Enon Sand and Gravel LLC; 2011-03-15 to current/open; source msha-controller-operator-history